Eight pounds of peanuts cost $24.00. Six pounds of walnuts cost half as much.

Which is more expensive and by how much?

24 is more expensive by $18.00

The eight pounds of peanuts are more expensive, by $1.

Step-by-step explanation:

If eight pounds of peanuts cost $24.00, then one pound of peanuts costs $24.00/8 = $3.00.

If six pounds of walnuts cost $12.00 (half as much), then one pound of walnuts costs $12.00/6 = $2.00.