the ages of a and b are in the ratio 3:5. after 9 years the ratio of their ages will be 3:4. the present age of b is?
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Age of a is 3x
Age of b is 5x
After 9 yrs,
a is 3x + 9 and b is 5x + 9
A/Q, 3x+9/5x + 9 = 3/4
By Cross multiplication
3(5x +9)=4(3x+9)
15x+27=12x+36
15x-12x=36-27
3x=9
x=9/3
x=3
Present age of b is 5x
Therefore, 5*3=15
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