a) 100%-20%=80%
b)80%=0,8
800x 0,8=640
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a) 100%-20%=80%
b)80%=0,8
800x 0,8=640
20% z 800 to 20*800:100= 160
800- 160=640
Uczniowie zjedli 640 pierogów
640 to x% z 800
64000:800= 80%
Uczniowie zjedli 80% pierogów