Bryce and four of his friends each ordered their own pizzas after football practice. Each pizza had 12 slices. Bryce and two friends ate 2/3 of their pizzas. The two remaining friends ate ¾ of their pizzas. How many slices of pizza were left?
Bryce and his 4 friends each ordered a pizza with 12 slices, so there were 5 pizzas x 12 slices per pizza = 
<gadget id="calculator">5*12</gadget>
<output>60</output>
60 slices of pizza.
2/3 of a pizza with 12 slices would be the same as 8/12 because 2/3 x 4/4 = 8/12.
Bryce and two of his friends each ate 2/3 or 8 slices of pizza, so 3 friends x 8 slices of pizza = 24 slices of pizza.
3/4 of a pizza with 12 slices would be the same as 9/12 because 3/4 x 3/3 = 9/12.
Bryce's two remaining friends each ate 3/4 or 9 slices of pizza, so 2 friends x 9 slices = 
<gadget id="calculator">2*9</gadget>
<output>18</output>
18 slices of pizza.
Together, Bryce and his friends ate 24 + 18 = 
<gadget id="calculator">24+18</gadget>
<output>42</output>
42 slices of pizza.
Of the 60 total slices of pizza, the friends ate 42, and 60 slices - 42 slices = 
<gadget id="calculator">60-42</gadget>
<output>18</output>
18 slices of pizza were left.

<result>18</result>