Question

The amount of diesel used by car X is ______.

Options

• 6 litres

• 12 litres

• 18 litres

• 24 litres

Answer 1

The amount of diesel used by car X is 12 litres.

Explanation:

Using the condition, $$\frac{72}{x} - \frac{72}{x + 3}=4$$, which gives x = 6 (the positive solution). Car X therefore uses `72/6 = 12` litres; 6, 18 and 24 litres are incorrect.