Question

If difference between the ages of X and Y is 12 years and the ratio of
their ages is 3:7, then what is the age of Y?
​

Answer 1

x:y=3:7

$7x = 3y \\ x = \frac{(3y)}{7 } \\ x - y = 12 \\ x = 12 + y \\ x = \frac{3y}{7 } \\ 12 + y = \frac{3y}{7} \\ 7(12 + y) = 3y \\ 84 + 7y = 3y \\ 4y = 84 \\ y = \frac{84}{4 } \\ y = 21$

Answer 2

Step-by-step explanation:

X : Y

3 : 7

Ratio =3+7=10.

Therefore,Y=3/10*12=2/5.

                   Y=2/5 * 10=4