Seventeen members of Tim’s family are going to an amusement park during the week of their family reunion. Adult tickets cost $34 each and child tickets cost $31.50 each. If the total cost for admission to the part is $558, how many adults went to the park?
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Question

Seventeen members of Tim’s family are going to an amusement park during the week of their family reunion. Adult tickets cost $34 each and child tickets cost $31.50 each. If the total cost for admission to the part is $558, how many adults went to the park? 
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tyteen4a03 · Answer

Let the amount of adults be x. The amount of children would be 17 - x. (Remember this!)
The equation would then become 34x + 31.5(17 - x) = 558. Solve for x.