The present age of two persons A and B are 40 and 60 years respectively. If after t years the ratio of their age will be 5 : 7. Then the value of t is :
Answer & explanation
Correct answer: option 1
ATQ,
⇒ \(\frac{40\;+\;t}{60\;+\;t}\) = \(\frac{5}{7}\)
⇒ 280 + 7t = 300 + 5t
⇒ 2t = 20
⇒ t = 10 years