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A machine can stamp 40 envelopes in 8 minutes. How many of these machines, working simultaneously, are required or needed to stamp 120 envelopes per minute?
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A machine can stamp 40 envelopes in 8 minutes. How many of these machines, working simultaneously, are required or needed to stamp 120 envelopes per minute?

User Bill Zeller
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You would need 24 machines
Because 1 machine makes 5 envelopes per minute so simultaneously 24 machines can make 120 envelopes per minute.
User Pochi
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