Multiple choice

A and B had 3 children born at intervals of 3 years each. If the sum of the ages of the children at present is 81 years, what is the age of the eldest child?

  1. 16 years

  2. 30 years

  3. 24 years

  4. 21 years

  5. 41 years
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let ages be x, x+3, x+6. Sum = 3x + 9 = 81. 3x = 72, x = 24. The eldest child is x+6 = 30.

AI explanation

Let the age of the youngest child be x; since the children were born at intervals of 3 years, their ages are x, x + 3, and x + 6. The sum of their ages is x + (x + 3) + (x + 6) = 81, which simplifies to 3x + 9 = 81. Solving for x gives x = 24, making the age of the eldest child 24 + 6 = 30 years.

Keep practicing — related questions