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WAEC Mathematics 2017 Paper

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Question : 15

Total: 49

The dimensions of water tank are 13cm, 10cm and 70cm. If it is half-filled with water, calculate the volume of water in litres

4.55 litres
7.50 litres
8.10 litres
9.55 litres

Solution:

Concept:

Volume of a cuboid is length × breadth × height. Convert cubic centimetres to litres using

1000\text{ cm}^3 = 1

litre.

Explanation:

Volume of the tank

= 13 \times 10 \times 70 = 9100\text{ cm}^3

.

Tank is half-filled, so volume of water

= \frac{9100}{2} = 4550\text{ cm}^3

.

Since

1

litre

= 1000\text{ cm}^3

, water volume

= \frac{4550}{1000} = 4.55

litres.

Answer:

4.55

litres, i.e., Option A.

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