Question 398997
14x+9(250-x)=3,000
14x+2,250-9x=3,000
5x=3,000-2,250
5x=750
x=750/5
x=150 $14 tickets were sold.
250-150=100 $7 tickets were sold.
Proof:
14*150+9*100=3,000
2,100+900=3,000
3,000=3,000