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MarshallBruceMathers
you would have 10 muffins left because 1/3 of 15 is 5 so 15-5=10
if you split 15 muffins into 3 groups, youre going to have 5 muffins in each group. so if you give a friend 1 out of the 3 groups, youre going to have 10 muffins left.