The ratio of a’s age 3 years ago and b’s age 5 years ago is 4:5. if a is 4 years younger than b then what is the present age of b?
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let B =x ,so A=x-4...
ac...to que..(x-4-3)×5=(x-5)×4..
5x-35=4x-20
x=15=B
ac...to que..(x-4-3)×5=(x-5)×4..
5x-35=4x-20
x=15=B
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