Answer:
4 backpacks
Explanation:
To answer this question, set up a ratio.
Pounds of goods : Number of backpacks
We know that one backpack can carry ten pounds of goods.
10 : 1
We need to find how many backpacks are needed to carry 35 pounds of goods.
Pounds of goods : Number of backpacks
10 : 1
35 : ?
To figure this out, we need to find how we got from 10 pounds to 35 pounds.
10 : 1
35 : ?
Well, to get from 10 to 35, you must multiply by 3.5
10 x 3.5 = 35
Whatever you do to one side of the ratio, do to the other side.
Pounds of goods : Number of backpacks
10 : 1
x3.5 x3.5
35 : 3.5
Round 3.5 to 4 because you wouldn't want half of a backpack!
Therefore, you will need 4 backpacks to carry 35 pounds of goods.