The ratio of the present ages of two boys is 3:4. After 3 years, the ratio of their ages is equal to will be 4:5.The ratio of their ages after 21 years will be
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let the present age of two boys = 3x and 4x
so according to question :-
1st boy = 3x
2nd boy = 4x
now after 3 yrs :-
age of 1st boy = 3x+3
age of 2nd boy = 4x+3
now according to question :-
3x+3 = 4x
and 4x+3 = 5x
now if 3x+3 = 4x
then 3x-4x = -3
-1x = -3
x = -3/-1 = 3
x = 3
now 3x= 3*3 = 9yrs
4x = 4*3 = 12 yrs
now according to question :-
after 21yrs
1st boy = 9+21 = 30yrs
2nd boy = 12+21 = 33yrs
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