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Mathematics 7 Online
OpenStudy (anonymous):

Saturday morning there were 7 adults and 20 kids at Pump and Jump Land. The morning cash registers show $236 were collected. In the afternoon there were 21 adults and 50 kids for a total amount of $618. What is the cost for 1 adult? $11 $8 $9 $12

OpenStudy (mertsj):

7a+20k=236 21a+50k=618

OpenStudy (mertsj):

Solve the system and you have your answer.

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