Final answer:
The correct answer is option C) 5. Bob bought 4 packs of peppermint gum and 3 packs of cinnamon gum. Each pack contained 10 pieces of gum.
Step-by-step explanation:
After dividing the gum equally between himself and 2 friends, there were no pieces of gum left over.
Bob bought a total of 4 packs of peppermint gum and 3 packs of cinnamon gum.
The total number of pieces of gum Bob bought is 4 packs x 10 pieces/pack + 3 packs x 10 pieces/pack = 40 + 30 = 70 pieces of gum.
If Bob divided the gum equally between himself and 2 friends, they would each get 70 pieces of gum / 3 people = 23.33 pieces of gum.
Since gum cannot be divided into fractions, there would be some pieces of gum left over. To find the number of pieces left over, subtract the number of pieces each person gets from the total number of pieces of gum Bob bought: 70 pieces of gum - (23.33 pieces of gum/person x 3 people) = 70 pieces of gum - 70 pieces of gum = 0 pieces of gum left over.
Therefore, the correct answer is option C) 5.