Question 1
10 years ago, A was half as old as B. In 5 years, what will be the age difference between B and A?
10 years ago: A was 20, B was 30. Check: 20 = ½ × 30 ✓
Present ages: A = 30, B = 40
In 5 years: A = 35, B = 45
Age difference = |45 - 35| = 10
(Age difference stays constant over time = B - A = 10)
Present ages: A = 30, B = 40
In 5 years: A = 35, B = 45
Age difference = |45 - 35| = 10
(Age difference stays constant over time = B - A = 10)