Kelly needs 8*3=<<8*3=24>>24 pieces of construction paper.
She buys glue which grows the supplies to 24+6=<<24+6=30>>30.
Unfortunately, she dropped 30/2=<<30/2=15>>15 supplies.
Rushing to the store, she buys more construction paper bringing her supplies back to 15+5=<<15+5=20>>20.
#### 20