Question 174173
a theather sold 478 tickets for a play . thickets cost $20 for adults and $13 for senior citizens.,if the total receipts were $6970, how many senior citizen tickets were sold?
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Quantity Equation: a + s = 478
Value Equation:  20a + 13s = 6970
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20a + 20s = 9560
20a + 13s = 6970
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Subtract 2nd from 1st to get:
7s = 2590
370
s = 370 (# of senior tickets sold)
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Cheers,
Stan H.