The user-friendly version of this content is available here.

The following content is copyright (c) 2009-2013 by Goods of the Mind, LLC.

This problem trains for: SAT-I, AMC-8, GMAT.

In the process of making onion flakes, onions lose 85% of their weight by dehydration. How many lbs of fresh onions are needed to produce 3 lbs of onion flakes?

Denote the amount of fresh onions by a. After dehydration only 15% of the weight is left. This weight must equal 3 lbs:

equation

equation

equation

Therefore, 20 lbs of fresh onions are needed.