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Kathy bought a total of 60 cupcakes. Supreme cupcakes cost $12 each and regular cupcakes cost $3 each. She spent a total of $90. Which system of equations will determine the number of supreme (s) and regular (r) cupcakes that Kathy purchased?

Sagot :

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Answer:

s + r = 60 and 12s + 3r = 90

Step-by-step explanation:

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