The numerator and the denominator of a fraction are thirteen and fifty, respectively. When a certain number is added to this num
erator and subtracted from this denominator, the resulting fraction has a numerator to denominator ratio of two to one. What is the number?
2 answers:
(13 + x)/(50 - x ) = (2/1)
Cross Multiply
2(50-x) = 1(13 + x)
100 - 2x = 13 + x
add 2x to both sides
100 -2x + 2x = 13 + x + 2x
100 = 13 + 3x
Subtract 13 from both sides
100 - 13 = 13 - 13 + 3x
87 = 3x
divide both sides by 3
29 = x
(13 + 29)/(50-29) = 42/21 = 2 to 1 ratio
The correct answer is 29.
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Ok so what we have to do is 4+7+9=c
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11+9=20
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