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Question

X is added to the numerator for the value of the fraction, 4/15, to be unchanged when the denominator is increased by 30. Find x.

Answer

(4 + x)/(15 + 30) = 4/15

(4 + x)/ 45 = 4/15

(4 + x) = 45(4/15) = 12

x = 8

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