A punch recipe calls for 3 liters of pineapple juice for every 5 liters of grape juice. How much pineapple juice should be added to 15 liters of grape juice?

Question

in math we have to use ratios and i can't figure it out. my brother asked me this question

Answer 1

A ratio can be expressed as a fraction and a proportion is comparing two ratios.

The ratio of pineapple juice to grape juice is expressed as 3/5. Now compare this to an equal ratio and solve for the variable by cross multiplying.

3/5=x/15

5x=45

/5 /5

x=9