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Mathematics
WAEC / WASSCE 2014
Number and Numeration
Solution
If \(\frac{2}{x - 3} - \frac{3}{x - 2}\) is equal to \(\frac{p}{(x - 3)(x - 2)}\), find p
A
-x - 5
B
-(x + 3)
C
5x - 13
D
5 - x
medium Difficulty
Verified Correct Answer: Option D
Step-by-Step Mathematical Solution
\(\frac{2}{x - 3} - \frac{3}{x - 2}\) = \(\frac{p}{(x - 3)(x - 2)}\)
\(\frac{2(x - 2) - 3(x - 3)}{(x - 3)(x - 2)}\) = \(\frac{p}{(x - 3)(x - 2)}\)
= \(\frac{2x - 4 - 3x + 9}{(x - 3)(x - 2)}\) = \(\frac{p}{(x - 3)(x - 2)}\)
\(\frac{-x + 5}{(x - 3)(x - 2)} = \frac{p}{(x - 3)(x - 2)}\)
p(x - 3)(x - 2) = -x + 5(x - 3)(x - 2)
p = -x + 5 or p = 5 - x
Source: Myschool Past Questions Archive (Record #36979)
Mathematics
WAEC / WASSCE 2014
Number and Numeration
Solution
Subtract \(\frac{1}{2}\)(a - b - c) from the sum of \(\frac{1}{2}\)(a - b + c) and \(\frac{1}{2}\)
(a + b - c)
A
\(\frac{1}{2}\) (a + b + c)
B
\(\frac{1}{2}\) (a - b - c)
C
\(\frac{1}{2}\) (a - b + c)
D
\(\frac{1}{2}\) (a + b - c)
medium Difficulty
Verified Correct Answer: Option A
Step-by-Step Mathematical Solution
\(\frac{1}{2}\)(a - b + c) + \(\frac{1}{2}\)(a + b - c) - [\(\frac{1}{2}\) (a - b - c)]
\(\frac{1}{2}a - \frac{1}{2}b + \frac{1}{2}c + \frac{1}{2}a + \frac{1}{2}b - \frac{1}{2}c - \frac{1}{2}a + \frac{1}{2}b + \frac{1}{2}c\)
= \(\frac{1}{2}a + \frac{1}{2}b + \frac{1}{2}c\)
= \(\frac{1}{2}(a + b + c)\)
Source: Myschool Past Questions Archive (Record #36980)
Mathematics
WAEC / WASSCE 2014
Number and Numeration
Solution
In parallelogram PQRS, QR is produced to M such that |QR| = |RM|. What fraction of the area of PQMS is the area of PRMS?
A
\(\frac{1}{4}\)
B
\(\frac{1}{3}\)
C
\(\frac{2}{3}\)
D
\(\frac{3}{4}\)
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
There are 3 triangles: \(\bigtriangleup\)MRS, \(\bigtriangleup\) and \(\bigtriangleup\) PRQ
Area PRMS has 2 triangles: \(\bigtriangleup\) MRS and \(\bigtriangleup\) RSP
the fraction = \(\frac{2}{3}\)
Source: Myschool Past Questions Archive (Record #36986)
Mathematics
WAEC / WASSCE 2014
Number and Numeration
In a cumulative frequency graph, the lower quartile is 18 years while the 60th percentile is 48 years. What percentage of the distribution is at most 18 years or greater than 48 years?
A
15%
B
35%
C
65%
D
85%
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #36988)
Mathematics
WAEC / WASSCE 2014
Number and Numeration
Solution
If a number is selected at random from each of the sets p = {1, 2, 3} and Q = {2, 3, 5}, find the probability that the sum of the numbers is prime
A
\(\frac{5}{9}\)
B
\(\frac{4}{9}\)
C
\(\frac{1}{3}\)
D
\(\frac{2}{9}\)
medium Difficulty
Verified Correct Answer: Option B
Step-by-Step Mathematical Solution
To find the probability that the sum of a randomly selected number from \( P = \{1, 2, 3\} \) and \( Q = \{2, 3, 5\} \) is prime:
Possible sums:
1 + 2 = 3 \(\text{prime})\)
1 + 3 = 4 \(\text{not prime})\)
1 + 5 = 6 \(\text{not prime})\)
2 + 2 = 4\(\text{not prime})\)
2 + 3 = 5 \(\text{prime})\)
2 + 5 = 7 \(\text{prime})\)
3 + 2 = 5 \(\text{prime})\)
3 + 3 = 6 \(\text{not prime})\)
3 + 5 = 8\(\text{not prime})\)
Prime sums: \( 3, 5, 5, 7 \) (total: 4 favorable outcomes).
Total outcomes: \( 3 \times 3 = 9 \).
Probability:
\(P = \frac{4}{9}\)
Thus, the probability that the sum is prime is \(\frac{4}{9}\)
Source: Myschool Past Questions Archive (Record #36989)
Mathematics
WAEC / WASSCE 2014
Number and Numeration
Solution
If log 5.957 = 0.7750, find log \(3 \sqrt{0.0005957}\)
A
\(\overline{4}\).1986
B
\(\overline{2}\).9250
C
\(\overline{1}\).5917
D
\(\overline{1}\).075
medium Difficulty
Verified Correct Answer: Option D
Step-by-Step Mathematical Solution
Log(0.0005957)\(^{\frac{1}{3}}\)
= Log(\(\frac{5.957}{10000})^{\frac{1}{3}}\)
= \(\frac{1}{3}\)Log(5.957) - \(\frac{1}{3}\)Log10\(^4\)
= \(\frac{0.7750}{3}\) - \(\frac{4}{3}\) =\(\frac{\overline3.225}{3}\) = \(\overline{1}\).075
Source: Myschool Past Questions Archive (Record #36991)
Mathematics
WAEC / WASSCE 2014
Number and Numeration
Solution
In what modulus is it true that 9 + 8 = 5?
A
mod 10
B
mod 11
C
mod 12
D
mod 13
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
9 + 8 = 17
17 + mod 12 = 1 rem 5
it is mod 12
Source: Myschool Past Questions Archive (Record #36996)
Mathematics
WAEC / WASSCE 2014
Number and Numeration
Solution
The radii of the base of two cylindrical tins, P and Q are r and 2r respectively. If the water level in p is 10cm high, what would be the height of the same quantity of water in Q?
A
2.5cm
B
5.0cm
C
7.5cm
D
20.0cm
medium Difficulty
Verified Correct Answer: Option A
Step-by-Step Mathematical Solution
volume of cylinder = \(\pi r^2h\)
volume of cylinder p = \(\pi r^2 \times 10\)
= 10\(\pi r^2\)
volume of cylinder Q = \(\pi (2r)^2 h\)
= 4\(\pi r^2\)h
4\(\pi r^2h = 10 \pi r^2\)
h = \(\frac{10}{4} = 2.5cm\)
Source: Myschool Past Questions Archive (Record #36998)
Mathematics
WAEC / WASSCE 2014
Number and Numeration
Diagram
Solution
The bar chart shows the scores of some students in a test. How many students took the test?
Attached Figure / Diagram
A
18
B
19
C
20
D
22
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
score 0 = 4 students
score 1 = 2 students
score 2 = 5 students
score 3 = 6 students
score 4 = 3 students
= 20 students
Source: Myschool Past Questions Archive (Record #36999)
Mathematics
WAEC / WASSCE 2014
Number and Numeration
Diagram
In the diagram, PQR is straight line, ( m + n) = 120o and ( n + r) = 100o. Find (m + r).
Attached Figure / Diagram
A
110o
B
120o
C
140o
D
160o
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #37003)
Mathematics
WAEC / WASSCE 2014
Number and Numeration
Diagram
Solution
In the diagram, PQR is a straight line, (m + n) = 120o and (n + r) = 100o. Find (m + r)
Attached Figure / Diagram
A
110o
B
120o
C
140o
D
160o
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
if m + n = 120o and n + r = 100o
then m + n = 120o
then r = 180o - 120o = 60o
also n + r = 100o
m = 180o = 80o
m + r is = 80o + 60o
= 140o
Source: Myschool Past Questions Archive (Record #37004)
Mathematics
WAEC / WASSCE 2014
Number and Numeration
Diagram
Solution
In the diagram, ST is parallel to UW, o, o, o and o. Calculate the value of y
Attached Figure / Diagram
A
20
B
25
C
45
D
65
medium Difficulty
Verified Correct Answer: Option B
Step-by-Step Mathematical Solution
xo + zo = 180o (sum of o + zo = 180o
zo = 180o - 45o
z = 135o
z + yo + 20o = 180o (sum of o + yo + 20o = 180o
yo + 155o = 180o
yo + 180o - 155o
yo = 25o
Source: Myschool Past Questions Archive (Record #37006)
Mathematics
WAEC / WASSCE 2014
Number and Numeration
Diagram
Solution
The graph given is for the relation y = 2x\(^2\) + x - 1. What are the coordinates of the point S?
Attached Figure / Diagram
A
(1, 0.2)
B
(1, 0.4)
C
(1, 2.0)
D
(1, 40)
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
Draw a straight line from point S to meet the y-axis, which cuts it at 2, and do the same for the x-axis which cuts it at 1. Therefore the coordinate of the point S is (1, 2)
NOTE: for this graph, each box(square) = 2.5cm on both axes.
Source: Myschool Past Questions Archive (Record #37007)
Mathematics
WAEC / WASSCE 2014
Number and Numeration
Diagram
Solution
The graph given is for the relation y = 2x\(^2\) + x - 1. Find the minimum value of y
Attached Figure / Diagram
A
0.00
B
-0.65
C
-1.25
D
-2.10
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
The minimum value of y is where the slope of the curve cuts the y - axis = - 1.25.
Source: Myschool Past Questions Archive (Record #37008)
Mathematics
WAEC / WASSCE 2014
Number and Numeration
Diagram
Solution
Determine the value of m in the diagram
Attached Figure / Diagram
A
80o
B
90o
C
110o
D
150o
medium Difficulty
Verified Correct Answer: Option B
Step-by-Step Mathematical Solution
In the figure above, a + 80º = 180º ( opp
Source: Myschool Past Questions Archive (Record #37010)