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a)
12/60*100%=1200/60%=20%
12/15*100%=1200/15%=80%
b)
15/60*100%=1500/60%=25%
15/12*100%=1500/12%=125%
2.
3 nie rozumiem
17 rozumiem
20 wszystkie wyrazy
3/20*100%=300/20%=15%