Sea "x" el número buscado y la quinta parte de quince igual a 15/5 =3
Entonces
x/3 = 15/5
x = 15 x 3 /5 = 45/5 = 9
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Verified answer
Sea "x" el número buscado y la quinta parte de quince igual a 15/5 =3
Entonces
x/3 = 15/5
x = 15 x 3 /5 = 45/5 = 9
15.3 = x
45 = x
Luego corroboramos 45/3 = 15