Tyra has 12 2/3 cups of sugar. If r is the amount of sugar called for in one batch of cookies,
the expression 12 2/3 ÷ r can be used to find how many batches Tyra can make with the sugar she has.
If r is 2/3 cup, how many batches of cookies can Tyra make?
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She has 12 2/3 cups
r (amount of sugar per batch)
Number of batches= cups of sugar/r
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Cups of sugar= 12 2/3 cups
r= 2/3 cup
12 2/3 ÷ 2 / 3
= (12*3 +2)/3 ÷ 2 / 3
= (36 +2)/3 ÷ 2 / 3
= (38)/3÷ 2 / 3
= 38/3 * 3/2
= 38*3 / 3*2
= 38/2
= 19
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Answer
Tyra can make 19 batches of cookies if r is 2/3