The number of cups of onion that are needed is 
Further explanation:
Explanation:
A salsa recipe uses green pepper, onion, and tomato in the extended ratio 
Consider that the amount of green pepper is 
Consider that the amount of onion is 
Consider that the amount of tomato is 
The total amount green pepper, onion and tomato can be obtained as follows,

There are total 117 cups of salsa.

The amount of onion used to make 117 cups of salsa can be obtained as follows,

The number of cups of onion that are needed is 
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Answer details:
Grade: High School
Subject: Mathematics
Chapter: Ratio and proportion
Keywords: proportional, salsa, recipe, green pepper, onion, tomato, extended, ratio, 1:3:9, cups, cups of onion, 117 cups, directly proportional, constant, proportionality equation, constant of proportionality.