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 11, B was 12. Check: 11 = ½ × 12 ✓
Present ages: A = 21, B = 22
In 5 years: A = 26, B = 27
Age difference = |27 - 26| = 1
(Age difference stays constant over time = B - A = 1)
Present ages: A = 21, B = 22
In 5 years: A = 26, B = 27
Age difference = |27 - 26| = 1
(Age difference stays constant over time = B - A = 1)