Using a balance scale and three weights, you can weigh any whole number of pounds from 1 to 13 lb. what are the weights? a. 1 lb 4 lb 5 lb c. 1 lb 5 lb 10 lb b. 1 lb 3 lb 9 lb d. 2 lb 6 lb 8 lb

I think the answer is b.  1, 3 and 9 pounds.

To weigh            Left  pan          Right pan

1  pound                  1                       object to be weighed

2                              3                    1  + object

3                              3                    object

4                              3+1                  object

and so on  

Answer is   1 , 3  and 9 pound weights.

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