Question

O eleva a cumaparat3/5 din intreaga cantitate de coli pentru copiator, ramanand 86 pe stoc .Cate coli a cumparat?

Answer 1

$x \to cantitatea \ initiala \\\\ \frac{3}{5} \ din \ x= \frac{3}{5} * x \to \frac{3x}{5} - \ cat \ s-a \ cumparat \\\\ x^{(5} -\frac{3x}{5} = \frac{5x-3x}{5} \to \frac{2x}{5} - restul \\\\\\ \frac{2x}{5} =86 \\\\ x=\frac{5* \not 86}{\not 2} \\\\ x=5*43 \\\\ \boxed{x=215}$

Answer 2

x- cantitatea de coli

x - x*3/5=86 |*5⇔

5x-3x=430 ⇔ 2x=430  |:2  ⇔

 x=215 coli