Question

Tickets to a concert cost $2 for children and $5 for adults. If 630 people attended the concert and the ticket sales totaled $2,910, how many children attended the concert?

Answer 1

c+a=630

a=630-c

2c+5a=2910 using a found above in this we have:

2c+5(630-c)=2910

2c+3150-5c=2910

-3c+3150=2910

-3c=-240

c=80

So 80 children attended the concert.