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carbazzy
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assume that 2 persons as a and b:
a-20/b-20 = 1/2 ........(1)
a/b = 5/6 .........(2)
a+20/b+20 .........(3)

using equation 2: 6a = 5b
but those values in equation 1 :
2a-40 = b-20
2a - b = 20........(Multiply this equation by 3)
6a - 3b = 60 (Now Put 6a = 5b as given above)
5b - 3b = 60
2b=60
b=30
Now Put b=30 in equation (2) so a = 25
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