SOLUTION: 3/7 of what fraction is 5/21

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Question 670335: 3/7 of what fraction is 5/21
Answer by ReadingBoosters(3246) About Me  (Show Source):
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%283%2F7%29%28x%29+=+%285%2F21%29
...
3x%2F7+=+5%2F21
...
Cross multipy
3x(21) = 7(5)
63x = 35
highlight_green%28x+=+35%2F63+=+5%2F9%29
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