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At a concert, a band sold t-shirts for $18 and hats for $12. They sold 60 t-shirts and hats combined for a total of $870. How many t-shirts did they sell? How many hats?​

 Aug 28, 2020
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Let x be the number of t-shirts sold. Let 60-x be the number of hats sold. They have a total cost of 870. We form an equation:

 

18x+12(60-x)=870

18x+720-12x=870

6x+720=870

6x=150

x=25

 

25 t-shirts were sold and 60-25=35 hats.

 Aug 28, 2020

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