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OpenStudy (anonymous):
A copy machine makes 36 copies per minute. How long does it take to make 135 copies?
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OpenStudy (anonymous):
which operation do you think you must use?
OpenStudy (anonymous):
cross multiply
OpenStudy (anonymous):
ok so multiply 36 times 136
OpenStudy (anonymous):
4896
OpenStudy (ineedhelplz):
135 divided by 36 = 3 minutes and ( 36 x 3 = 108 ) ( 135-108= 27 ) ( so that equals to 3 parts out of 4 ( 3 x 9 = 27 and 4x9= 36 )) 3 out of 4 parts equals 0.75, so it would be 3.75 minutes but this would then become 3 minutes and 45 seconds. also equals to 225 seconds
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OpenStudy (anonymous):
ok good
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