Question

1/7 de 1/3 de 3/? de 630 = 12 ? que numero es

Answer 1

$\frac{1}{7} \ de \ \frac{1}{3}\ de\ \frac{3}{x} \ de\ 630 = 12 \\ \\ \ "de" \ indica \ multiplicacion \\ \\ \frac{1}{7} * \frac{1}{3}* \frac{3}{x}*630 = 12 \\ \\\frac{1*1*3*630}{7*3*x}=12 \\ \\ \frac{1*1*3*630}{7*3*x}=12 \\ \\ \frac{90}{x} = 12 \\ \\ 90 = 12*x \\ \\ \frac{90}{12} =x \\ \\ x = \frac{30}{4} \\ \\ entonces \ \frac{3}{x} \Rightarrow \frac{3}{ \frac{30}{4}} = \boxed{ x=\frac{15}{2}}$

El número que falta es  $\frac{2}{5}$ 

$\frac{3}{x} = \frac{3}{ \frac{15}{2}} \\ \\ \frac{3}{x} = \frac{2}{ 5}$

$Verificamos \ \frac{1}{7} * \frac{1}{3}* \frac{3}{x}*630 = 12 \\ \\ \frac{1}{7} * \frac{1}{3}* \frac{3}{ \frac{15}{2}}*630 = 12 \\ \\ \frac{1}{7} * \frac{1}{3}* \frac{2}{5}*630 = 12 \\ \\ \frac{2}{105} * 630 = 12 \\ \\ 12 = 12 \checkmark$


Espero que te sirva, salu2!!!!