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

Respuesta :

Let they be x

[tex]\\ \rm\Rrightarrow 60\%\: of\:x=15[/tex]

[tex]\\ \rm\Rrightarrow \dfrac{3}{5}x=15[/tex]

[tex]\\ \rm\Rrightarrow x=15\times \dfrac{5}{3}[/tex]

[tex]\\ \rm\Rrightarrow x=5(5)[/tex]

[tex]\\ \rm\Rrightarrow x=25[/tex]

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