Weighted Averages

There haven’t been many weighted average problems printed in GMAT Official Guides. However, the GMAT Focus seems to contain these problems more frequently than the older version of the GMAT, so this is a topic worth exploring.

Official Guide practice (find these in your Official Guide or at www.gmatclub.com)

PS15517 A manufacturer makes and sells 2 products, P and Q.

PS02903 Jackie has two solutions

PS13244 At a certain fruit stand

PS16904 Seed mixture X is 40 percent ryegrass

PS14237 As shown in the diagram above, a lever resting on a fulcrum

2SK1G4 A rabbit on a controlled diet is fed daily 300 grams of a mixture of two foods

To stimulate your understanding of this concept, write your own problem. Perhaps consider the situation of mixing two drinks, one of which is 10% orange juice and the other of which is 80% orange juice. How would you achieve different strengths of orange juice in the resulting mixture?