Multiple choice

The average age of four players is 18.5 years. If the age of the coach is also included, the average age is increased by 20%. The age of the coach is:

  1. 31 years

  2. 37 years

  3. 28 years

  4. 34 years
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The average age of 4 players is 18.5, so their total age is 4 × 18.5 = 74 years. When the coach is included, the average increases by 20%, so new average = 18.5 × 1.2 = 22.2. Total age with coach = 5 × 22.2 = 111 years. Coach's age = 111 - 74 = 37 years. Option B is correct.

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