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

Question 210015: what number must be added to the numerator of 3/10 to produce the fraction 4/5
Found 2 solutions by stanbon, rapaljer:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
what number must be added to the numerator of 3/10 to produce the fraction 4/5
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Equation:
(3+x)/10 = 4/5
Cross-multiply and solve for "x":
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5(3+x) = 40
3+x = 8
x = 5
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Cheers,
Stan H.
Reply to stanbon@comcast.net
Answer by rapaljer(4671) (Show Source): You can put this solution on YOUR website!
Let x = the number to be added.

Remember that if then

So, means that

15+5x = 40
5x=40-15
5x=25
x=5

Check: Add 5 to the numerator of 3 which gives you 8. .

It checks!!!

R^2
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