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OpenStudy (anonymous):
Easy Medal A group of friends is addressing wedding invitations. Casey can address 20 envelopes in one hour, Anne can address 47 envelopes in two hours, and Paula can address 70 envelopes in three hours. About how long will it take them to address 420 envelopes? 6.92 hours 22.83 hours 18.39 hours 6.28 hours
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jigglypuff314 (jigglypuff314):
Casey -> 20 per hour Anne -> 40/2 = 23.5 per hour Paula -> 70/3 = 23.3... per hour 20 + 23.5 + 23.3 = 66.8333 420 / 66.8333 =
OpenStudy (anonymous):
D 6.28 hours
jigglypuff314 (jigglypuff314):
yep
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