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Mathematics, 15.06.2020 10:57 raeprince9213

Num certo bairro da cidade de Beira após o ciclone Idai, 120 voluntários trabalhavam de manhã, 130 trabalhavam à tarde, 80 trabalhavam à noite, 60 trabalhavam de manhã e a tarde, 50 trabalhavam de manhã e a noite, 40 trabalhavam à tarde e a noite e 20 trabalhavam nos três períodos. (a) Quantos voluntários trabalhavam em 2 períodos? (b) Quantos voluntários tem o bairro? (c) Quantos voluntários não trabalhavam á tarde? (d) Quantos voluntários trabalhavam só de manhã?

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