The store sold 120 ounces fewer ounces of cashew than walnut.
Explanation:
Cashew = 6 ounces
Walnut = 10 ounces
Total cans sold = 30
Cashew = 30 x 6
= 180 ounces
Walnut =30 x 10
= 300 ounces
The store sold 120 ounces fewer ounces of cashew than walnut.