if sarah puts an equal number of tan shells into some boxes and has 1 shell left over, how many boxes will she use? how many shells will be in each box? there is 10 tan shells
10 - 1 = 9 as the number of shells in all boxes. 9 can only be divided equally by 3
9/3 = 3
She will use 3 boxes
Each box will have 3 shells
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