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The present of Mohit and Mayank are in the ratio of $11:8$. After 8 years, their ages will be $5:4$. Find their present ages.
Given :
Present ages of Mohit and Mayank are in the ratio of $11:8$.
After 8 years, the ratio of their ages will be $5:4$.
To do :
We have to find their present ages.
Solution :
The present ages of Mohit and Mayank are in the ratio of $11:8$.
Let the Present age of Mohit be 11x and the age of Mayank be 8x.
After 8 years, the age of Mohit $=11x+8$
The age of Mayank $=8x+8$
After 8 years, the ratio of their ages will be $5:4$.
So, $\frac{11x+8}{8x+8}=\frac{5}{4}$
Cross multiply,
$4(11x+8) = 5(8x+8)$
$44x+32=40x+40$
$44x-40x = 40-32$
$4x=8$
$x = \frac{8}{4}$
$x=2$
The present ages of Mohit and Mayank are, $11x = 11(2)=22, 8x=8(2)=16$.
Therefore, the present ages of Mohit and Mayank are 22 and 16 respectively.