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16/20 * 100 % = 80 %
Odp. Uczeń rozwiązał 80% zadań poprawnie.
240x0,20=48
240+48=288
b
20%
2
20 - 4=16
16:20x100%=80%
240 * 20%=48
a=240+48=288
b) o 20% wieksza
2. 20-3-1=16
20-100%
16-x
x=16*100/20=1600/20=80%