[Question]: Amber is baking cakes for her party. She has invited 8 friends and each one will want two slices of cake. Each cake makes 6 slices. If she bakes 4 cakes, how many slices will be left over at the end if she eats three herself?
[Answer]: Her friends will eat 16 slices of cake because 8 x 2 = 16. There will be 19 slices eaten in total because 16 + 3 = 19. She is making 24 slices of cake because 4 x 6 = 24. There will be 5 pieces left over because 24 - 19 = 5.
So the answer is 5.

[Question]: Jacob takes four tests in his physics class and earns 85, 79, 92 and 84. What must he earn on his fifth and final test to have an overall average of 85?
[Answer]: Since wants needs an 85 as an average and he takes five tests, he must have 85 * 5 = 425 total points. Currently he has 85 + 79 + 92 + 84 = 340 points. So for his fifth test he needs 425 - 340 = 85 points.
So the answer is 85.

[Question]: Brenda weighs 10 pounds more than 3 times Mel's weight. If Brenda weighs 220 pounds, what is Mel's weight?
[Answer]:
Let Mel's weight be m. Brenda’s weight is 3 * m + 10 = 220 pounds. Thus 3m = 220 - 10 = 210 pounds. Therefore Mel's weight is m = 210 / 3 = 70 pounds.
So the answer is 70.