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Mathematics 21 Online
OpenStudy (anonymous):

)A scanner scanned 63 photos in 9 minutes. If it scans photos at a constant rate, it can scan _____ photos in 21 minutes.

OpenStudy (anonymous):

will fan and medal !!!!!!!!!!!

OpenStudy (uri):

|dw:1416576958930:dw| If he scans 63 photos in 9 minutes,We will of course scan more than 63 photos in 21 min,so direct proportion. cross multiply. @joejoe213

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