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Weighted average method
Assumption: X+Y=100
AVG=30 (30% X+Y)
Focusing only on Ryegrass --> A2=40 (40% X) A1= 25 (25% Y) --> w2=X & w1=Y
w1/w2= A2-AVG/AVG-A1 --> 40-30/30-25= 10/5 --> 10w1 + 5w2=15 --> 5/15*100 (100 is X+Y) = 100/3 = X *100% = 100/3 % --> 33,3%
Assumption: X+Y=100
AVG=30 (30% X+Y)
Focusing only on Ryegrass --> A2=40 (40% X) A1= 25 (25% Y) --> w2=X & w1=Y
w1/w2= A2-AVG/AVG-A1 --> 40-30/30-25= 10/5 --> 10w1 + 5w2=15 --> 5/15*100 (100 is X+Y) = 100/3 = X *100% = 100/3 % --> 33,3%
06 Aug 2024, 17:45
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Anhminh
It's called the "Official Guide for GMAT® Review". There's typically a new version every year. You can find the current one here: https://www.mba.com/exam-prep/gmat-offi ... stion-bank
Does that help?
