20% z jakiej liczby da nam 55?
20% z x = 55
0,2 * x = 55
x = 275
spr.
0,2 * 275 = 55
20% --- 55
100% --- x
x=100%·55/20%=275
Odp.: Szukana liczba to 275.
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20% z x = 55
0,2 * x = 55
x = 275
spr.
0,2 * 275 = 55
20% --- 55
100% --- x
x=100%·55/20%=275
Odp.: Szukana liczba to 275.