Which equation should be used to solve 81 + × =108

Ashopper bought a watermelon a pack of napkins and some paper plates in his state there was no tax on food the tax rate on non-food items is 5% the total for the three items he bought was 825 before tags and he paid $0.19 in taxes how much did the watermelon cost

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9

We have 339 ounces of jam to be divided up equally for 12 people how muny ounces will each person get