Mathematics, 08.01.2021 20:00 nicollexo21

Sam and two friends put letters in envelopes on Monday. The three of them take two hours to put 600 letters in envelopes.
On Tuesday Sam has three friends helping.
Working at the same rate, how many letters should the four of them be able to put in
envelopes in two hours?

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Sam and two friends put letters in envelopes on Monday. The three of them take two hours to put 600...