a and b age ratio is 9:4 .after seven years their age ratio is 5:3 then what is there present age
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present age of a is 18 years
and b is 8 years
and b is 8 years
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A/B=9/4
A=9/4B
after seven years ratios are
(A+7)/(B+7)=5/3
3(A+7)=5(B+7)
3A+21=5B+35
3A=5B+14
3×9/4B=5B+14
27B=4(5B+14)
27B=20B+56
7B=56
B=8
So A=9/4×8
A=9×2
A=18
So presents ages of A and B are 18 and 8
respectively.
A=9/4B
after seven years ratios are
(A+7)/(B+7)=5/3
3(A+7)=5(B+7)
3A+21=5B+35
3A=5B+14
3×9/4B=5B+14
27B=4(5B+14)
27B=20B+56
7B=56
B=8
So A=9/4×8
A=9×2
A=18
So presents ages of A and B are 18 and 8
respectively.
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