The total ages of father and son is 42 years and the diffrence of thier ages is 22 years. What is son's age now?
A
10 years
B
11 years
C
12 years
D
13 years
Correct Answer: 10 years
let Father's age XSon's age Ythen X + Y = 42..... (1)and, X - Y = 22...... (2)By subtracting from equation 1 to 2, X + Y - (X - Y) = 42 - 22X + Y - X + Y = 202Y = 20Y = 10 (Son's age)