A 12‑year‑old girl gains 4 cm in height in 3 months during puberty. Assuming a constant growth rate, estimate her total height gain after 2 years from this age.

Step-by-step solution

1. Compute monthly growth: $\frac{4\text{ cm}}{3\text{ months}}=1.33\text{ cm/month}$.
2. Calculate yearly growth: $1.33\text{ cm/month}\times 12\text{ months}=16\text{ cm/year}$.
3. Find total growth over 2 years: $16\text{ cm/year}\times 2=32\text{ cm}$.

Concept tested: Growth Rate Calculation

Published 1 October 2026 · How this solution was prepared and checked