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WAEC WASSCE 2015

WAEC Mathematics 2015 past questions

6 objective questions from the 2015 WAEC Mathematics paper. Answer each one, then reveal the answer and explanation.

All WAEC Mathematics past questions

  1. Question 1

    Probability

    A bag contains 2 red, 5 blue, and 6 green balls. A ball is picked at random. What is the probability that it is blue?

    1. Option A: $\frac{2}{13}$
    2. Option B: $\frac{5}{13}$
    3. Option C: $\frac{6}{13}$
    4. Option D: $\frac{5}{8}$
    Show the answer to question 1

    Answer: B, $\frac{5}{13}$

    There are 5 blue balls out of 13, so the probability is $\frac{5}{13}$.

  2. Question 2

    Linear equations

    Solve for $x$: $5x + 6 = 31$.

    1. Option A: x = 5
    2. Option B: x = 6
    3. Option C: x = 4
    4. Option D: x = 7.4
    Show the answer to question 2

    Answer: A, x = 5

    Subtract 6 from both sides to get 5x = 25, then divide by 5: x = 5.

  3. Question 3

    Simple interest

    Find the simple interest on ₦27,500 for 3 years at 11% per annum.

    1. Option A: ₦9,075
    2. Option B: ₦36,575
    3. Option C: ₦3,025
    4. Option D: ₦18,150
    Show the answer to question 3

    Answer: A, ₦9,075

    I = PRT ÷ 100 = 27,500 × 11 × 3 ÷ 100 = ₦9,075.

  4. Question 4

    Indices

    Evaluate $2^{2} \times 2^{1}$.

    1. Option A: 4
    2. Option B: 64
    3. Option C: 6
    4. Option D: 8
    Show the answer to question 4

    Answer: D, 8

    Add the indices: $2^{2} \times 2^{1} = 2^{3} = 8$.

  5. Question 5

    Percentages

    A trader bought a radio for ₦5,500 and sold it for ₦7,425. Find the percentage profit.

    1. Option A: 25.9%
    2. Option B: 40%
    3. Option C: 70%
    4. Option D: 35%
    Show the answer to question 5

    Answer: D, 35%

    Profit = ₦1,925. Percentage profit = 1,925 ÷ 5,500 × 100 = 35%.

  6. Question 6

    Statistics

    Find the mean of 51, 53, 57, 46, 48.

    1. Option A: 52
    2. Option B: 50
    3. Option C: 255
    4. Option D: 51
    Show the answer to question 6

    Answer: D, 51

    The sum is 255 and there are 5 numbers, so the mean is 255 ÷ 5 = 51.

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