Question

Sixty percent of the runners who ran the marathon finished the race. If fifteen runners finished, then how many runners ran in the marathon?

Answer 1

Let they be x

`\\ \rm\Rrightarrow 60\%\: of\:x=15`

`\\ \rm\Rrightarrow (3)/(5)x=15`

`\\ \rm\Rrightarrow x=15* (5)/(3)`

`\\ \rm\Rrightarrow x=5(5)`

`\\ \rm\Rrightarrow x=25`