If a backpack can fit 10 pounds of good, how many backpacks are necessary for 35 pounds of good.

4 backpacks

Step-by-step 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.