Answer: 1
Explanation: Each child can have up to 13 balloons each. If all 4 children have 13 balloons, that leaves an extra balloon out. 13*4=52, which leaves the 1 extra balloon.
The answer to x would be 3
The new cost would be 19.55.
Explanation: 1. 23 * 0.15 = 3.45
2. 23 - 3.45= 19.55