Question

At Sunny's Pizza Parlor, 5 out of every 9 pizzas sold are

pepperoni. Out of the next 144 pizzas, how many would
not be pepperoni?

Answer 1

Answer: 64

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Work Shown:

5 out of 9 are pepperoni, so 4 out of 9 are not pepperoni

(4 not pepperoni)/(9 pizzas) = (x not pepperoni)/(144 pizzas)

4/9 = x/144

4*144 = 9x

576 = 9x

9x = 576

x = 576/9

x = 64

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Slightly alternative route:

(5 pepperoni)/(9 pizzas) = (y pepperoni)/(144 pizzas)

5/9 = y/144

5*144 = 9y

720 = 9y

9y = 720

y = 720/9

y = 80

Out of the next 144 pizzas, 80 are expected to be pepperoni. That means there should be 144-80 = 64 pizzas that aren't pepperoni.