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1. The age of the two friends were in the ratio of 6:5. If the sum of their ages is 55. Then after how many years their ratio will become 8:7? a) 11 b) 7 c) 10 d) 12
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- ANS: C
6x+5x = 55
x = 5
so current ages of two friends are 30 and 25
So after 10 yrs, it becomes 40 and 35
so ratio is 8:7 - 12 years agoHelpfull: Yes(7) No(0)
- x/y=6:5
i.e,x=(6/5)y .....(1)
given, x+y=55 ...(2)
substituting (1) in (2)
we get y=25
x=30
then..
(30+z)/(25+z) =8/7
=> 210+7z=200+8z
z=10 years - 12 years agoHelpfull: Yes(4) No(0)
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