Question

Max will use 3 bags of cement for his project. Each bag of cement needs 3 1/2 gallons of water added to it.

Answer 1

First this belongs in math. But heres the answer.
For every bag you need 3.5 gallons of water. You have three bags so multiply by three. You end up with 3(3.5) simplify and you get 10.5

Answer 2

3.5x3=10.5 ........................