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Question

The ages of A and B are in the ratio 5:6. Five years from now Their ages will be 6:7. Find their present ages.

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Solution

Let A present age is a.
Let B present age is b.
For,
a:b = 5:6
Let the common multiple be c. there fore,
a=5c and b=6c and
A age fine years from now is a+5
B age fine years from now is b+5
hence,
(a+5):(b+5)=6:7
5c+56c+5=67
35c+35=36c+30
hence the c=5
hence the present age of A is 25
and B is 30

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