Answer:
There are 1680 tickets
Explanation:
If 3/4 of the tickets are sold
1 - 3/4 of the tickets are unsold
4/4 -3/4 = 1/4
There are 1/4 of the tickets left
There are 420 tickets left
1/4 of the tickets = 420
Multiply each side by 4
4*1/4 tickets = 4*420
tickets = 1680
There are 1680 tickets