40 ist 20% von welcher Zahl?

200

$\frac{40}{x} = \frac{20}{100}$ $40/x = 20/100$
$\frac{40}{x} \cdot 100 = \frac{20}{100} \cdot 100$ $40/x*100 =20/100*100$

$\frac{4000}{x} = 20$ $4000/x = 20$

$4000 \cdot \frac{x}{x} = 20 \cdot x$ $4000*x/x =20*x$

$4000 = 20 x$ $4000 = 20x$

$\frac{4000}{20} = \frac{20 \cdot x}{20}$ $4000/20 = (20*x)/20$

$200 = x$ $200 = x$