At a college production of a play, 490 tickets were sold. the ticket prices were $8, $10, and $12, and the total income from ticket sales was $4640. how many tickets of each type were sold if the combined number of $8 and $10 tickets sold was 6 times the number of $12 tickets sold?

Explanation:

Givens

Equations

Solution

You can get x3 right away.

x1 + x2 + x3 = 490         Substitute 6*x3 for x1 + x2

6*x3 + x3 = 490             Combine

7*x3 = 490                     Divide by 7

7*x3/7 = 490/7               Do the division

x3 = 70                           Answer x3

x1 + x2 + 70 = 490         Let x3 = 70    

x1 + x2+70-70=490-70  Subtract 70  

x1 + x2 = 420                  

8x1 + 10x2 + 12x3 = 4640       Use the third equation to get an amount for x1,x2

8x1 + 10x2 + 12*70 = 4640

8x1 + 10x2 + 840 = 4640        Subtract 840  

8x1 + 10x2 = 4640 - 840         Combine  

8x1 + 10x2 = 3800  

8x1 + 8x2 = 420*8

8x1 + 8x2 = 3360

8x1 + 10x2 = 3800

8x1 + 8x2 =  3360                   Subtract

2*x2 = 440

2*x2/2 = 440/2

x2 = 220

x1 + x2 + x3 = 490

x1 + 220 + 70 = 490

x1 + 290 = 490

x1 = 200

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