Question

Ajay is on the swim team. he improves this time on the 50 yard freestyle from 32 seconds to 31 seconds. what's the percent decrease in his tim3

Answer 1

from 32 seconds to 31 seconds decrease in 1 second, therefore

32 seconds -----> 100%

1 second ---------> x

$\begin{gathered} 32\times x=1\times100 \\ 32x=100 \\ \frac{32x}{32}=\frac{100}{32} \\ x=3.125 \end{gathered}$

answer: the percent decrease in 3.125%