SOLUTION: six years ago the ratio of kunal and sager age is 6:5,hence 4 years later the ratio becomes 11:10.then what is kunal's present age?

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Question 1007730: six years ago the ratio of kunal and sager age is 6:5,hence 4 years later the ratio becomes 11:10.then what is kunal's present age?
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Just solved this one...please see my solution...
We can solve this using two proportions, which will give us two equations to solve from...we have (using k and s for their ages NOW)...
%28k-6%29%2F%28s-6%29+=+6%2F5 and %28k%2B4%29+%2F+%28s%2B4%29+=+11%2F10
If we cross-multiply these we get
5(k-6) = 6(s-6)
5k - 30 = 6s - 36
5k - 6s = -6
and
10(k+4) = 11(s+4)
10k + 40 = 11s + 44
10k - 11s = 4
Double the first one and subtract
10k - 11s = 4
-(10k - 12s = -12)
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s = 16
k = 18