Richard practiced each of 3 piano solos for 5/12 of an hour. how long did he practice in all?

Multiplying an even number of negative numbers gives an answer that is choose from:

You call the pizza store and find out that eachpizza has 12 slices. you expect 16 people tocome, and you estimate each person will eat 3slices. how many pizzas should you order

You have 3 boxes, one "strawberries"; one "mentos" and one "mixed".but you know that all the labels are in incorrect order .how do you know witch is witch?