Question
What number should be subtracted from both the terms of
the ratio 17 : 21 so as to make it as 1 : 2 ?Solution
Required number = x =`(17-x)/(21-x)=1/2` ⇒ 34 - 2x  = 21 - x ⇒ 2x - x  = 34 - 21 ⇒ x  = 13
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