Question 30
Ages of Lalu and Balu arein the ratio of 1 : 2. After 7 years their ages ratio changes to 3 : 5. The elder person age is:
Solution
let
lalu's age = x
and balu's age = 2x
1x+7 : 2x +7 = 3:5
5 ( x + 7 ) = 3 ( 2x + 7 )
5x + 35 = 6x + 21
35 - 21 = 6x - 5x
x = 14 yrs ...
2x = 28 yrs
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