A beverage is made by mixing 1 part of water with 3 parts of fruit juice. How many parts of water are mixed with 1 part of fruit juice?

1/3

Step-by-step explanation:

for every 1 part of water there is 3 parts juice so if there's only 1 part juice it would be a 1/3

Mix (1/3) part water with 1 part fruit juice.

Step-by-step explanation:

One approach follows:

1 part water ↔ 3 parts fruit juice

Divide both sides by 3:

(1/3) part water ↔ 3/3 parts fruit juice (same as 1 part fruit juice)

Answer: Mix (1/3) part water with 1 part fruit juice.