Question Library
Browse, filter, and study verified past examination questions with step-by-step mathematical reasoning.
Searching 18,000+ Questions...
Sifting topics, KaTeX formulas & verified solutions
Showing 871–885 of 14893 verified questions
Sort by:
Mathematics
UTME / JAMB 2024
Ratios, Proportions and Rates
Solution
The ratio of men to women in a 20-member committee is 3:1. How many women must be added to the committee to make the ratio of men to women 3:2?
A
2
B
5
C
7
D
8
medium Difficulty
Verified Correct Answer: Option B
Step-by-Step Mathematical Solution
The ratio of men to women = 3:1
Number of committee members = 20
number of men in the committee = \(\frac{3}{4} \times 20 = 15\)
Number of women in the committee = \(\frac{1}{4} \times 20 = 5\)
New ratio = 3:2, and let the number of women to be added to make the ratio 3:2 be x
3:2 = 15:5+x
\(\frac{3}{2} = \frac{15}{5 + x }\)
15 + 3x = 30
3x = 30 - 15 = 15
x = \(\frac{15}{3}\) = 5
Therefore, the number of women to be added to make the ratio of men to women 3:2 = 5.
Source: WAEC / JAMB / NECO Classroom Archive (Record #70179)
Mathematics
UTME / JAMB 2024
Financial Arithmetic
Solution
Find the amount if simple interest is paid yearly at 5% per annum for 3 years, on a principal of # 200,000.00
A
# 23, 000.00
B
# 30,000.00
C
# 300,000.00
D
# 230,000.00
medium Difficulty
Verified Correct Answer: Option D
Step-by-Step Mathematical Solution
Amount = principal + Interest
I = \(\frac{ P\times R \times T}{100}\)
P = #200,000, R = 5%, T = 3 yrs
I = = \(\frac{ 200,000\times 5 \times 3}{100}\)
= 2000 x 15 = #30,000
A = 200,000 + 30,000 = #230,000.
Source: WAEC / JAMB / NECO Classroom Archive (Record #70171)
Mathematics
UTME / JAMB 2024
Financial Arithmetic
Solution
A boy bought Oranges at the rate of #24.00 for 5 and sold it at the rate of # 30.00 for 4 Oranges. Find the profit made of the ones sold
A
# 24.00
B
#30.00
C
# 10.80
D
#20.00
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
The boy bought 5 oranges for #24.00. Therefore, the cost price per orange is: c.p = \(\frac{24}{5}\) = #4.800
The boy sold 4 oranges for #30.00. Therefore, the selling price per orange is: s.p = \(\frac{30}{4}\) = # 7.50
Profit per orange is calculated as:
Profit per orange = SP per orange − CP per orange = =7.50 − 4.80 = 2.70
If the boy sold 4 oranges, the total profit from selling 4 oranges is: Total Profit = 4 \times 2.70 = #10.80
Source: WAEC / JAMB / NECO Classroom Archive (Record #70249)
Mathematics
UTME / JAMB 2024
Variations
Solution
y is inversely proportional to x and y = 4, when x = \(\frac{1}{2}\), find x when y = 10
A
2
B
10
C
\(\frac{1}{5}\)
D
\(\frac{1}{10}\)
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
y ∝ \(\frac{1}{x}\)
y = \(\frac{k}{x}\)
y = 4, x = \(\frac{1}{2}\), find x when y = 10
4 = \(\frac{k}{\frac{1}{2}}\)
k = 2
Therefore, x = \(\frac{2}{10} = \frac{1}{5}\)
Source: WAEC / JAMB / NECO Classroom Archive (Record #70174)
Mathematics
UTME / JAMB 2024
Variations
Solution
U varies directly as the square root of V when U = 24, V = 9, find the value of V when U = 16.
A
0.32
B
4
C
6
D
0.25
medium Difficulty
Verified Correct Answer: Option B
Step-by-Step Mathematical Solution
U = K\(\sqrt{V}\)
24 = K\(\sqrt{9}\)
K = 8
U = 8\(\sqrt{V}\)
16 = 8\(\sqrt{V}\)
2 = \(\sqrt{V}\)
V = 4
Source: WAEC / JAMB / NECO Classroom Archive (Record #70294)
Mathematics
UTME / JAMB 2024
Variations
Solution
If B varies inversely as c\(^{\frac{1}{3}}\) and C = 27 when B = 2, find the value of the constant of proportionality K.
A
3
B
6
C
9
D
12
medium Difficulty
Verified Correct Answer: Option B
Step-by-Step Mathematical Solution
B = \(\frac{K}{C^{\frac{1}{3}}}\)
2 = \(\frac{K}{27^{\frac{1}{3}}}\)
K = 2 x 3 = 6
Source: WAEC / JAMB / NECO Classroom Archive (Record #70297)
Mathematics
UTME / JAMB 2024
Variations
Solution
If x is inversely proportional to y and x = 9 when y = 4, find the law containing x and y
A
x = \(\frac{16}{y}\)
B
x = \(\frac{36}{y}\)
C
x = \(\frac{y}{36}\)
D
x = \(\frac{13}{y}\)
medium Difficulty
Verified Correct Answer: Option B
Step-by-Step Mathematical Solution
x = \(\frac{K}{y}\)
9 = \(\frac{K}{4}\)
K = 9 x 4 = 36
Therefore, the law connecting x and y is: x = \(\frac{36}{y}\)
Source: WAEC / JAMB / NECO Classroom Archive (Record #70321)
Mathematics
UTME / JAMB 2024
Linear Inequalities
Diagram
Solution
Identify the equation of the shaded region in the given graph
Attached Figure / Diagram
A
y > 1
B
x < 1
C
X > 1
D
y < 1
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
The shaded part is after 1, and on the x-axis, showing that x is greater than 1
i.e x > 1
Source: WAEC / JAMB / NECO Classroom Archive (Record #70185)
Mathematics
UTME / JAMB 2024
Linear Inequalities
Diagram
Solution
The graph above represents inequalities
Attached Figure / Diagram
A
3x +4y ≥12, x >0, y > 0
B
3x + 4y\(\leq\) 12, x ≥ 0, y ≥ 0
C
3x + 4y <12, x \(\leq\) 0, y ≥ 0
D
3x + 4y < 12, x ≥ 0, y ≥ 0
medium Difficulty
Verified Correct Answer: Option D
Step-by-Step Mathematical Solution
3x + 4y < 12, x \ge 0, y \ge 0 represent the graph above.
Source: WAEC / JAMB / NECO Classroom Archive (Record #70188)
Mathematics
UTME / JAMB 2024
Polynomials
Solution
Find the roots of x\(^3\) - 19x - 30=0
A
-5, 3, and 2
B
5, 3, and -2
C
5, -3 and -2
D
-5, -3 and 2
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
x\(^3\) - 19x - 30
test x = 5
5\(^3\) −19(5) − 30 = 125 − 95 − 30 = 0
(x - 5) is a factor.
x\(^3\) - 19x - 30 divided by (x - 5) = x\(^2\) + 5x + 6
factorizing x\(^2\) + 5x + 6, we have (x+2)(x+3)
(x+2)(x+3)(x - 5) = 0
x = -2, -3, and 5.
Source: WAEC / JAMB / NECO Classroom Archive (Record #70300)
Mathematics
UTME / JAMB 2024
Progressions (AP & GP)
Solution
The sum to infinity of a GP is 100, find its first term if the common ratio is -\(\frac{1}{2}\)
A
150
B
155
C
160
D
165
medium Difficulty
Verified Correct Answer: Option A
Step-by-Step Mathematical Solution
S\(_\infty\) = \(\frac{a}{1- r}\) since 1 > r
S\(_\infty\) = 100, r = \(\frac{-1}{2}\), a = ?
100 = \(\frac{a}{1- \frac{-1}{2}}\) = \(\frac{a}{\frac{3}{2}}\) ( - - = +)
a = 100 x \(\frac{3}{2}\) = 150
Therefore, the first term (a) = 150
Source: WAEC / JAMB / NECO Classroom Archive (Record #70192)
Mathematics
UTME / JAMB 2024
Progressions (AP & GP)
Solution
Find the 7\(^{th}\) term of the sequence -10, 50, -250 ...........
A
165250
B
156250
C
-156250
D
-165,250
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
T\(_7\) = ar\(^{n-1}\) = ar\(^{6}\)
a = - 10, r = - 5
T\(_7\) = -10(-5)\(^{6}\)
T\(_7\) = - 10 x 15625 = - 156250
Source: WAEC / JAMB / NECO Classroom Archive (Record #70254)
Mathematics
UTME / JAMB 2024
Binary Operations
Solution
If p * q = 2p + pq + q, find p when ( p * 2) - (p * 1) = 40
A
39
B
40
C
41
D
42
medium Difficulty
Verified Correct Answer: Option A
Step-by-Step Mathematical Solution
p * q = 2p + pq + q
(p*2) - (p*1) = 40
firstly, p = p and q = 2, secondly p = p and q = 1
then, 2p + 2p + 2 - (2p + p + 1) = 40
4p + 2 - 3p - 1 = 40
p + 1 = 40
p = 40 - 1 = 39
Source: WAEC / JAMB / NECO Classroom Archive (Record #70180)
Mathematics
UTME / JAMB 2024
Binary Operations
Solution
A binary operation * is defined on a set of real numbers by x*y = x\(^y\) for all values of x and y, if x * 2 = x, find the possible values of x.
A
0, 2
B
1, 2
C
0, 1
D
2, 2
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
Given the operation defined by \( x * y = x^y \),
\[x * 2 = x \implies x^2 = x\]
Rearranging gives: \[x^2 - x = 0 \implies x(x - 1) = 0\]
Thus, the possible values of \( x \) are: \[\boxed{0 \text{ and } 1}\]
Source: WAEC / JAMB / NECO Classroom Archive (Record #70348)
Mathematics
UTME / JAMB 2024
Coordinate Geometry
Solution
Find the perimeter of a triangle whose vertices pass through ( 3, 2), (4, 5) and (6, 2) in surd form.
A
3 + \(\sqrt{12} + \sqrt{13}\)
B
3 - \(\sqrt{10} + \sqrt{13}\)
C
3 + \(\sqrt{10} + \sqrt{13}\)
D
3 - \(\sqrt{12} + \sqrt{13}\)
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
From the diagram above, Calculate the distance between any two vertices as follows.
PQ = \(\sqrt{(6 - 3)^2 + (2-2)^2}\) = \(\sqrt{9}\) = 3
QR = \(\sqrt{(6 - 4)^2 + (2-5)^2}\) = \(\sqrt{13}\)
PR = \(\sqrt{(4 - 3)^2 + (5 - 1)^2}\) = \(\sqrt{10}\)
\(\therefore\), perimeter = 3 + \(\sqrt{13}\) + \(\sqrt{10}\)
Source: WAEC / JAMB / NECO Classroom Archive (Record #70253)