A Navy cadet is 6 years younger than his instructor. If the sum of their ages is 42, the cadet's age is:
Q1. A Navy cadet is 6 years younger than his instructor. If the sum of their ages is 42, the cadet's age is:
Answer: 18
Explanation: Let the cadet's age be c. Then c + (c + 6) = 42, so 2c = 36 and c = 18.