Multiple choice

Three years ago, the average age of A and B was 18 years. Now, with C joining them, the average age becomes 22 years. How old is C now?

  1. 24 years

  2. 27 years

  3. 28 years

  4. 30 years
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

3 years ago, sum of A and B = 18 * 2 = 36. Now, sum of A and B = 36 + 3 + 3 = 42. Now, sum of A, B, C = 22 * 3 = 66. C = 66 - 42 = 24.

AI explanation

Three years ago, the average age of A and B was 18, so their combined age at that time was 2 times 18, equaling 36 years. Their current combined age is 36 plus 2 times 3, resulting in 42 years. With C joining them, the total age of all three is 3 times 22, which is 66 years, making C's age 66 minus 42, resulting in 24 years.

Keep practicing — related questions