SOLUTION: What number must be added to the numerator of 3/10 to produce the fraction 4/5

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Question 209989This question is from textbook
: What number must be added to the numerator of 3/10 to produce the fraction 4/5 This question is from textbook

Answer by Earlsdon(6294) About Me  (Show Source):
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Since 4%2F5+=+8%2F10 then 8%2F10-3%2F10+=+5%2F10 so add 5 to the numerator.