(.I)) 10. A manager purchased a total of 21 coffee mugs and key chains. Each coffee mug cost ( 8.50 ), and each key chain cost ( 2.75 ). If the manager spent a total of ( 132.50 ), how many coffee mugs did the manager purchase?

Question

(.I)) 10. A manager purchased a total of 21 coffee mugs and key chains. Each coffee mug cost (  8.50 ), and each key chain cost (  2.75 ). If the manager spent a total of (  132.50 ), how many coffee mugs did the manager purchase?

Accepted Answer

Step:1 ：Let x be the number of coffee mugs and y be the number of key chains.Step:2 ：Write the system of equations: ( begin{cases} x+y=21  8.50x+2.75y=132.50 end{cases} )Step:3 ：Solve for x and y: (x=10), (y=11)

Answer

Step: 1 ：Let x be the number of coffee mugs and y be the number of key chains.Step: 2 ：Write the system of equations: ( begin{cases} x+y=21  8.50x+2.75y=132.50 end{cases} )Step: 3 ：Solve for x and y: (x=10), (y=11)

(.I)) 10. A manager purchased a total of 21 coffee mugs and key chains. Each coffee mug cost \( \$ 8.50 \), and each key chain cost \( \$ 2.75 \). If the manager spent a total of \( \$ 132.50 \), how many coffee mugs did the manager purchase?

Answer

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