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WAEC Mathematics 2013 Paper

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Question : 8

Total: 48

Four oranges sell for Nx and three mangoes sell for Ny. Olu bought 24 oranges and 12 mangoes. How much did he pay in terms of x and y?

N94x + 6y)
N(6x + 4y)
N(24x + 12y)
N(12x + 24y)

Solution:

Concept:

Find the cost of one orange and one mango, then multiply by the quantities bought.

Explanation:

Cost of one orange =

\frac{Nx}{4}

Cost of 24 oranges =

24 \times \frac{Nx}{4} = N6x

Cost of one mango =

\frac{Ny}{3}

Cost of 12 mangoes =

12 \times \frac{Ny}{3} = N4y

Total amount paid =

N6x + N4y = N(6x + 4y)

Answer:

Olu paid

N(6x + 4y)

, which is option B.

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