Question
Fred bought equal number of boxes of green balls and packets of yellow balls. 4 boxes and 5 packets contain 40 balls. 5 boxes and 4 packets contain 41 balls. There were 108 balls altogether. How many boxes of green balls did Fred buy?
4 m

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Fred bought equal number of boxes of green balls and packets of yellow balls. 4 boxes and 5 packets contain 40 balls. 5 boxes and 4 packets contain 41 balls. There were 108 balls altogether. How many boxes of green balls did Fred buy?