Question

The total cost is the number of cans times $.70

Answer 1

Let's say that the number of cans= c.
And the total cost= t.

t=c.70
AKA
total cost= number of cans times .70.

You do this because each can is $.70. SO you do the number of cans times the price for one can, and that equals the total cost.
I hope I helped!