Answer:
There are 25 pieces of gum in total.
Explanation:
If with b you refer at the amount of tubes, then you have 5 pieces of chewed gum for each tube and 5 tubes in total. Thus, you have to multiply your total of 5 tubes for 5, the amount of pieces of chewed gum, and you obtain that there are 5*5 = 25 pieces of chewed gum in total.
I hope this helped you!