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WAEC Mathematics 2011 Paper

Question : 31

Total: 47

Solution:

Concept:

Height of a liquid in a rectangular container is found by dividing its volume by the base area.

Explanation:

Convert the volume of oil from litres to cubic centimetres.

1

litre

= 1000\ \mathrm{cm}^3

96

litres

= 96 \times 1000 = 96000\ \mathrm{cm}^3

Base area of the container is:

220 \times 40 = 8800\ \mathrm{cm}^2

Volume

=

length

\times

breadth

\times

height

96000 = 8800 \times h

h = \frac{96000}{8800} = 10.91\ \mathrm{cm}

Correct to the nearest cm,

h = 11\ \mathrm{cm}

Answer:

11\ \mathrm{cm}

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