Question

If car X used 4 litres of diesel more than car Y in the journey, then :

Options

• $$\frac{72}{x-3} - \frac{12}{x} = 4$$

• $$\frac{72}{x+3} - \frac{12}{x} = 4$$

• $$\frac{72}{x} - \frac{72}{x+3} = 4$$

• $$\frac{72}{x-3} - \frac{72}{x+3} = 4$$

Answer 1

`bb((72)/(x) - (72)/(x + 3) = 4`

Explanation:

Car X uses `72/x` litres and car Y uses `72/(x + 3)` litres, so “X used 4 litres more” means subtract Y’s amount from X’s. The other options use an incorrect mileage expression or the wrong amount.