Kenneth S. answered 01/05/17
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
Have you tried to do this? If not, why not get started--because striving (attempting) is a most informative way of learning, by thinking about your assumptions, and making efforts to come to grips with a problem. We actually learn by failing, sometimes; it's the prelude to making a breakthrough.
Sixty pieces, from cutting pies into 5 easy pieces, each. How many pies, altogether?
Then subtract # of pies donated by the cafeteria. The result (difference, from subtraction) must be the answer.
You CAN do it!