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

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Question 487761: What number must be added to the numerator of 3/10 to produce the fraction 4/5?
Thank you!
Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
(3/10) + x = (4/5)
x = (4/5) - (3/10)
x = (8/10) - (3/10)
x = (8-3)/10
x = 5/10
that's your answer
(3/10) + (5/10) = (3 + 5)/10 = 8/10 = 4/5