Difficulty: Medium
Correct Answer: 43 yr
Explanation:
Introduction / Context:This chain problem links Manoj to Wasim, Wasim to Rehana, and then adds a fixed offset for Manoj’s father. Work backward from Rehana.
Given Data / Assumptions:
Concept / Approach:Sequential substitution from the farthest known (Rehana’s future) to the target (Manoj’s father).
Step-by-Step Solution:
Rehana now = 85 − 7 = 78.Wasim = 78 − 12 = 66.Manoj = (3/11)*66 = 18.Father = 18 + 25 = 43.Verification / Alternative check:
All relations are satisfied numerically.Why Other Options Are Wrong:
Common Pitfalls:
Final Answer:43 yr
Discussion & Comments