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Mathematics
UTME / JAMB 2022
Geometry and Trigonometry
Diagram
Solution
In the diagram above, XY = 8cm and OX = 5cm. Find Oz
Attached Figure / Diagram
A
9cm
B
3.4cm
C
9.1cm
D
3cm
medium Difficulty
Verified Correct Answer: Option D
Step-by-Step Mathematical Solution
hyp = 5cm, adj = \(\frac{8cm}{2}\) 4cm, opp = xcm
Pythagoras theorem:
hyp\(^2\) = opp\(^2\) + adj\(^2\)
5\(^2\) = x\(^2\) + 4\(^2\)
x\(^2\) = 25 - 16
x = \sqrt9
x = 3cm
Source: WAEC / JAMB / NECO Classroom Archive (Record #64390)
Mathematics
UTME / JAMB 2022
Number Bases
Solution
Evaluate \((101_{two})^3\)
A
\(111101_{two}\)
B
\(11111101_{two}\)
C
\(1111101_{two}\)
D
\(11001_{two}\)
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
\((101_{two})^3\) = \((5_{ten})^3\)
5\(^3\) = 125
And 125 = \(1111101_{two}\)
Source: WAEC / JAMB / NECO Classroom Archive (Record #64148)
Mathematics
UTME / JAMB 2022
Number Bases
Solution
The equivalent of (10110.011)\(_2\) in base 10 is?
A
26.325
B
24.372
C
42.443
D
22.375
medium Difficulty
Verified Correct Answer: Option D
Step-by-Step Mathematical Solution
Using the expansion method on (10110.011)\(_2\)
(1 * 2\(^4\)) + (0 * 2\(^3\)) + (1 * 2\(^2\)) + (1 * 2\(^1\)) (0 * 2\(^0\)) + (0 * 2\(^{-1}\)) + (1 * 2\(^{-2}\)) + (1 * 2\(^{-3}\))
(1*16) + 0 (1*4) + (1*2) + 0 + 0 + (1*\(\frac{1}{4}\)) + (1*\(\frac{1}{8}\))
16 + 4 + 2 + (0.25 + 0.125)
22 + 0.375
(10110.011)\(_2\) = 22.375\(_{10}\)
Source: WAEC / JAMB / NECO Classroom Archive (Record #64359)
Mathematics
UTME / JAMB 2022
Indices
Solution
Solve for k in the equation \(\frac{1}{8}^{k+2}\) = 1
A
2
B
-4
C
-2
D
4
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
\((8^{-1})^{k+2}\) = \((8^{0})\)
base 8 cancel out on both sides
-1(k+2) = 0
-k -2 = 0
: k = -2
Source: WAEC / JAMB / NECO Classroom Archive (Record #64147)
Mathematics
UTME / JAMB 2022
Logarithms
Solution
Evaluate Log\(_2\) 8√2
A
3.0
B
4.5
C
3.5
D
2.5
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
where Log\(_2\) 8\sqrt2 → Log\(_2\) \sqrt128
→ Log\(_2\) 128\(^\frac{1}{2}\)
= \(\frac{1}{2}\) * (Log\(_2\) 128) → \(\frac{1}{2}\) * (Log\(_2\) 2\(^7\))
= 7 * \(\frac{1}{2}\) * (Log\(_2\) 2)
where (Log\(_2\) 2) = 1
→ 7 * \(\frac{1}{2}\) * 1
= \(\frac{7}{2}\) or 3.5
Source: WAEC / JAMB / NECO Classroom Archive (Record #64276)
Mathematics
UTME / JAMB 2022
Surds
Solution
Simplify \(\frac{1}{3-√2}\) in the form of p + q√2
A
\(\frac{7}{3}\) - \(\frac{1}{7√2}\)
B
\(\frac{7}{3}\) + \(\frac{1}{7√2}\)
C
\(\frac{3}{7}\) - \(\frac{1}{7√2}\)
D
\(\frac{3}{7}\) + \(\frac{√2}{7}\)
medium Difficulty
Verified Correct Answer: Option D
Step-by-Step Mathematical Solution
Rationalization with conjugate \({3+\sqrt2}\)
\(\frac{1}{3-\sqrt2}\)
→ \(\frac{1 * [3+\sqrt2]}{[3-\sqrt2][3+\sqrt2]}\)
= \(\frac{3+\sqrt2}{9 -3\sqrt2 + 3\sqrt2 - \sqrt4}\)
= \(\frac{3+\sqrt2}{9 - 2}\) → \(\frac{3+\sqrt2}{7}\)
= \(\frac{3}{7}\) + \(\frac{\sqrt2}{7}\)
Source: WAEC / JAMB / NECO Classroom Archive (Record #64209)
Mathematics
UTME / JAMB 2022
Fractions, Decimals, Percentages & Approximation
Solution
What will be the result obtained when the numerator of \(\frac{96}{50}\) is decreased by 37.5% and its denominator decreased by 20%.
A
1.5
B
\(\frac{5}{2}\)
C
\(\frac{96}{48}\)
D
0.5
medium Difficulty
Verified Correct Answer: Option A
Step-by-Step Mathematical Solution
Numerator: 96 → 37.5% of 96 = 36
Decreased by 36 → 96 - 36
New numerator = 60
Denominator: 50 → 20% of 50 = 10
Decreased by 10 → 50 - 10 = 40
New Denominator = 40
New fraction = \(\frac{60}{40}\) or 1.5
Source: WAEC / JAMB / NECO Classroom Archive (Record #64278)
Mathematics
UTME / JAMB 2022
Fractions, Decimals, Percentages & Approximation
Solution
A poultry farmer realized 200 eggs from his birds and sold 5 \(\frac{1}{2}\) crates of eggs. What percentages of eggs are left?
A
82.5%
B
15%
C
17.5%
D
85%
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
5 crates = 30 eggs * 5 = 150eggs
1/2 crate = 15 eggs
Total sold = 165
remainder = 200 - 165 = 35
And 35 is equivalent 17.5% of the realized eggs
Source: WAEC / JAMB / NECO Classroom Archive (Record #64279)
Mathematics
UTME / JAMB 2022
Fractions, Decimals, Percentages & Approximation
Solution
If a dress is sold for #3800.00 at 20% discount. what is its original price?
A
#3,000.00
B
#4,000.00
C
#5,000.00
D
#4,750.00
medium Difficulty
Verified Correct Answer: Option D
Step-by-Step Mathematical Solution
It is given that the cost of the item reduces to #3800.00 after the discount on the item.
Let original price = x
x – (20% of x) = 100
⇒ x – 0.2x = 100
⇒ 0.8x = #3800
⇒ x = \(\frac{3800}{0.8}\)
⇒ x = 4,750
Source: WAEC / JAMB / NECO Classroom Archive (Record #64412)
Mathematics
UTME / JAMB 2022
Sets & Set Operations
Diagram
Solution
The shaded portion in the venn diagram above represents?
Attached Figure / Diagram
A
F - (E n F) - (G n F)
B
E' n F n G'
C
E u F u G
D
F
medium Difficulty
Verified Correct Answer: Option B
Step-by-Step Mathematical Solution
-The shaded/stripped portion in the diagram is set F only.
-This implies that sets E and G though present in the Universal set, are not included in the expression.
-Mathematically; we have E' n F n G'
Source: WAEC / JAMB / NECO Classroom Archive (Record #64153)
Mathematics
UTME / JAMB 2022
Sets & Set Operations
Solution
If n(P) = 20 and n(Q) = 30 and n(PuQ) = 40, find the value n(PnQ)
A
10
B
30
C
15
D
40
medium Difficulty
Verified Correct Answer: Option A
Step-by-Step Mathematical Solution
n(PuQ) = n(p) + n(q) - n(PnQ)
40 = 20 + 30 - n(PnQ)
n(PnQ) = 50 - 40 = 10
Source: WAEC / JAMB / NECO Classroom Archive (Record #64402)
Mathematics
UTME / JAMB 2022
Matrices and Determinants
Solution
Find the determinant of the matrix A = \(\begin{pmatrix} 2 & 3 \\ 1 & 3 \end{pmatrix}\)
A
4
B
2
C
5
D
3
medium Difficulty
Verified Correct Answer: Option D
Step-by-Step Mathematical Solution
|A| = (2*3) - (1*3)
→ 6 - 3
= 3
Source: WAEC / JAMB / NECO Classroom Archive (Record #64275)
Mathematics
UTME / JAMB 2022
Variations
Solution
The cost C of running a school is directly proportional to the number of students N, if 20 students cost #10,000, How many students can #1,000,000 cover?
A
3000
B
1000
C
2000
D
4000
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
if 20 students = 10000
: #500 per student
#1,000,000 \div 500
= 2,000 cover students
Source: WAEC / JAMB / NECO Classroom Archive (Record #64366)
Mathematics
UTME / JAMB 2022
Operations on Algebraic Expressions
Solution
Three times a certain number (x), minus 2 is less than the number minus 6.Find the possible values of x.
A
x <-2
B
x>2
C
x>-2
D
x<2
medium Difficulty
Verified Correct Answer: Option A
Step-by-Step Mathematical Solution
Three times a certain number (x) = 3x
minus 2 = -2
is less than = <
the number minus 6 = x -6
Mathematically; 3x - 2 < x - 6
collect like terms
3x - x < -6 + 2
2x < -4
x < -2 is the possible values of x
Source: WAEC / JAMB / NECO Classroom Archive (Record #64404)
Mathematics
UTME / JAMB 2022
Change of Subject of Formula
Solution
Given that r = \( \sqrt \frac{3v}{\pi h} \), make v the subject of the formula
A
v = 3 \(πr^2\) h
B
v = \(\frac{πrh}{3}\)
C
v = \(\frac{πr^2h}{3}\)
D
v = 3πrh
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
square both sides to remove the big square root
→ r\(^2\) = \(\frac{3v}{\pih}\)
cross multiply
3v = r\(^2\) * \pih
v = \(\frac{\pir^2h}{3}\)
Source: WAEC / JAMB / NECO Classroom Archive (Record #64274)