Ratio and Proportion Practice Test 3

Question : 25 of 40

Marks: +1, -0

A fraction is in the ratio 29 : 37. What number must be subtracted from both the numerator and denominator so that the fraction becomes 31 : 30?

Solution:

Let the number subtracted be x.
Then,

{29-x}/{37-x}=31/30

30 (29 -x) = 31 (37 - x)
870 - 30x = 1,147 - 31x
x = 277

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