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BECE Mathematics 2012 Paper

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Question : 9

Total: 40

A tank contains 400 litres of water. If 100 litres is used, what percentage is left?

$25\%$
$30\%$
$40\%$
$75\%$

Solution:

Concept:

The percentage of water left is found by comparing the remaining water to the original total.

Explanation:

Total water in the tank is

400

litres.

Water used is

100

litres.

So, water left

= 400 - 100 = 300

litres.

Percentage left

= \frac{\text{water left}}{\text{total water}} \times 100\%

= \frac{300}{400} \times 100\%

= \frac{3}{4} \times 100\%

= 75\%

Thus,

75\%

of the water remains in the tank.

Answer:

Option D.

75\%

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