Question

She spent £30 on petrol. In total how much money did she spend?

Answer 1

Assuming that petrol accounts for 1/4 of the pie chart as this seems evident on a visual level, £30 must also be a quarter of the total amount that was pent. This means that £30 × 4 = £120 was spent in total.
Please do correct me in the comments if you find this answer to be false, this is understandable as I have made an assumption.

Answer 2

£120

Explanation:

From the circle diagram it can be assumed that a quarter of her expenses go towards petrol. Therefore the total amount that she spends is four times more than the amount she spent on petrol:

`Total = 4*30=120`

The total amount of money she spent is £120.