1) 1/36 + 1/45 = 1/20
2) 1 ÷ 20 = 201/36+1/45=1/20
1÷20=20
Ответ за 20 дней.
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1) 1/36 + 1/45 = 1/20
2) 1 ÷ 20 = 201/36+1/45=1/20
1÷20=20
Ответ за 20 дней.