A 13‑year‑old boy grows 3 cm in 2 months during puberty. Assuming a constant growth rate, how many centimeters will he grow in 6 months?

Step-by-step solution

1. Compute monthly growth by dividing the total growth by the time period: $\frac{3\text{ cm}}{2\text{ months}}=1.5\text{ cm/month}$.
2. Multiply the monthly growth by the desired period: $1.5\text{ cm/month}\times 6\text{ months}=9\text{ cm}$.

Concept tested: Growth rate during puberty

Published 7 October 2026 · How this solution was prepared and checked