Question

Four times as many as adults attended a fundraising concert.A child ticket cost $7.A total of $5520 was collected.How many people attended the concert?

Answer 1

There is a lack of conditions:
If N is the number of adults attended the concert, 4N is the number of children.
$7 * 4N + $X * N = $5520.
We must know the cost of adult ticket.