Question

A grading machine can grade 48 tests in I minute. How long will it take the machine to grade 300 tests?

Answer 1

start by writing the ratio

$\frac{48\text{ tests}}{1\text{ minute}}$

now do the multiplication

$300\text{ tests}\cdot\frac{1\text{ minute}}{48\text{ tests}}=6.25\text{ minutes}$

the machine will take about 6.25 minutes to grade the 300 tests.