Baking muffins

Aunt Polly is baking muffins at a speed of 4 muffins per minute. Tom comes into the kitchen when Aunt Polly has 12 muffins and begins to eat these muffins at a speed of 6 muffins per minute. When he finally leaves the kitchen, there are four muffins at the table. How long did Tom stay in the kitchen?

Correct answer:

t =  4 min

Step-by-step explanation:


12 + 4·t - 6·t = 4

2t = 8


t = 8/2 = 4

t = 4

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