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Question

What number must be subtracted from each of 14,17,34 and 42 so that the difference will be proportional?

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Solution

Let x must be subtracted
then,
14x/17x=34x/42x
(14x)(42x)=(34x)(17x)
x256x+558=x251x+578
5x=10
x=2
So, the number must be subtracted from each of 14,17,34 and 42 is 2.

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