Problem: The denominator of a fraction is more than the numerator. If 3 subtracted to the numerator and to the denominator and to the denominator, the resulting fraction is equivalent to ½. What is the original fraction?
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Answer:
Let x = the numerator
Let x + 3 = the denominator
(x + 5)/(x + 8) = 4/5 Cross multiply
5x + 25 = 4x + 32
x = 7
x + 3 = 10
7/10