Have you all had a go? No one got it right.

The answer (and no I never got it right ) is:

And No I still don't understand it either!

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Each piston has a value of 10x3 = 30

Each tyre has a value of 5 so 10+5+5=20

Each spark plug has a value of 2 so 5+2+2=9

Bottom line you do a multiplication first. So 2x10=20 + the tyre whose value is 5 so the answer is 25.

It's the BODMAS rule:

**Rules of ****Ordering** in Mathematics - **BODMAS**
- Brackets (parts of a calculation inside brackets always come first).
**Orders** (numbers involving powers or square roots).
- Division.
- Multiplication.
- Addition.
- Subtraction.