Question

Cody spent 27 hours practicing piano last week That is three times longer than his sister practiced. How many hours (h) did his sister practice

Answer 1

Time Cody's sister spent practicing x

Time spent by Cody is 3 times x = 27 hours

Express Cody time mathematically and solve for x

$\begin{gathered} 3\times x=27 \\ 3x=27 \\ x=\frac{27}{3} \\ x=9\text{hours} \end{gathered}$

Since the time Cody's sister spent is x

Hence, Cody's sister spent 9 hours