Question

A grading machine can grade 48 multiple-choicetests in 1 minute. How long will it take themachine to grade 300 tests?

Answer 1

48 tests ----> 1 minute

300 tests --> x minutes

`\begin{gathered} 48* x=300*1 \\ 48x=300 \\ (48x)/(48)=(300)/(48) \\ x=(25)/(4)=6.25 \end{gathered}`

answer: 6.25 minutes