In a fruit cocktail, for every 15 ml of orange juice you need 25 ml of apple juice and 10 ml of coconut milk. What proportion of the cocktail is coconut milk? Give your answer as a fraction in its simplest form

1/5

reason:

if there are 15ml of orange juice, that means there has to be 25ml of apple juice and 10ml of coconut milk
that means the total amount of cocktail there is equals 50ml
10ml is 1/5 of 50ml, which means 1/5 of the cocktail is made of coconut milk