Question

petrol and engine oil has to mix in the ratio 5 : 2 for a certain motorcycle how much engine oil is needed to mix with 10 litres of petrol ​

Answer 1

4 liters of engine oil

Explanation:

petrol : engine oil

5:2

10:?

we notice that if we double 5:2 becomes 10:4 so the missing part of engine oil is 4.