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An auditorium seats 1500 people. Floor seats cost $15 and balcony seats cost $10. If the place is sold out and they make $2100 how many seats are on the floor and in the balcony?

1 answer

number on the floor --- g
number on balconey --- b

g + b = 1500
15f + 10b = 2100 ---> 3f + 2b = 420

solve for g and b

hint: double the first and subtract from the 2nd
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