A delivery company has a total of 160 cars and vans - Edexcel - GCSE Maths - Question 6 - 2022 - Paper 1

We are told that $\frac{1}{8}$ of the cars use electricity. Therefore, the number of cars using electricity is:

$\frac{1}{8} \times 48 = 6$

It is given that 25% of the cars use diesel. Hence, the number of cars using diesel is:

$0.25 \times 48 = 12$

To find the number of cars that use petrol, we first add the number of cars using electricity and diesel:

$6 + 12 = 18$

Then, we subtract this from the total number of cars:

$48 - 18 = 30$

Thus, the number of cars that use petrol is 30.