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

Answer:

Step-by-step explanation:

Set this up as a ratio of proportions of petrol : oil

$\frac{p}{o}$ and if the ratio of the mix has to be 5p to 2 oil then:

$\frac{p}{o}:\frac{5}{2}$  We need to find how much oil, x, is needed to mix with 10 liters of petrol. Completing the proportion with that ratio gives us the problem in its entirety:

$\frac{p}{o}:\frac{5}{2}=\frac{10}{x}$ and cross multiply

5x = 20 so

x = 4 liters of oil are needed to mix with 10 liters of petrol.