30-100% 30-100%
X-20% x-50%
X=30*20/100 x=30*50/100
X=600/100 x=1500/100
X=6 x=15
6 учеников получили5,а 15 учеников получили4
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30-100% 30-100%
X-20% x-50%
X=30*20/100 x=30*50/100
X=600/100 x=1500/100
X=6 x=15
6 учеников получили5,а 15 учеников получили4