SOLUTION: What is the proportion for 5 3w -- = -- 7 21

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Question 792605: What is the proportion for
5 3w
-- = --
7 21
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
7*3w=5*21
21w=105
w=105/21
w=5
5/7=15/21