Find a ratio that compares the relative sizes of the

quantities.

13,000 pounds to 3 tons

There are 2,000 pounds in a ton so multiply that by 3 to get the number of tons for that side of the ratio. You get 6,000 pounds. So the set up would be

13,000 pounds to 6,000 pounds. Or simplify it down to 13 pounds to every 6 pounds.