<human>:  There is a pie-eating contest at school. Adam eats three more pies than Bill. Sierra eats twice as many pies as Bill. If Sierra ate 12 pies, how many pies were eaten in total?
<bot>: How many pies did Bill eat? ** Bill ate 12 / 2 = <<12/2=6>>6 pies.
How many pies did Adam eat? ** Adam ate 6 + 3 = <<6+3=9>>9 pies.
How many pies were eaten in total? ** They ate a total of 6 + 9 + 12 = <<6+9+12=27>>27 pies.
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