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x - 100 %
83 x = 2000
x = 24
83 1/3% z x = 20 osób
83 1/3 % = 250/3% = 250/3:100 = 250/300 = 25/30 = 5/6
5/6 * x = 20 |*6/5
x = 20*6/5 = 4*6 = 24
Odp.: W klasie jest 24 uczniów