Correct option is C
Given:
Let son's present age = x
Then father's present age = x + 30
After 10 years:
Son's age = x + 10
Father's age = x + 30 + 10 = x + 40
Formula:
Father’s future age = 3 × Son’s future age
Solution:
=> x + 40 = 3(x + 10)
x + 40 = 3x + 30
40 – 30 = 3x – x
10 = 2x
x = 5
️ Correct Answer: (c) 5