szhouroneuaanger szhouroneuaanger

23-12-2016
Mathematics

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A dishwasher can wash 14 plates per minute. Another dishwasher can wash 10 plates per minute. How many minutes will the two working together need to wash 1,560 plates?

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Nirina7 Nirina7

25-12-2016

the dishwashers can wash 14p/mn+10p/mn=24plates /mn
so
1mn ..................> 24 plates
X=? <...................1,560 plates
so X= 1560/24= 65 minutes

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