20 задач ---- 100%
13 задач ----- х%
х=13*100:20=65
Ответ: 65%.
20-100%
13-х%
х=100*13:20=65%
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20 задач ---- 100%
13 задач ----- х%
х=13*100:20=65
Ответ: 65%.
20-100%
13-х%
х=100*13:20=65%