The total marks of science and music are 70 + 80 = 150. When you add the marks she scored in social studies, the full marks become 150 + 85 = 235. She scored half as many marks in physics as she scored music, totaling 1 / 2 * 80 = 40 marks. When you add the marks she scored in physics to the total marks of the other subjects, the full marks become 235 + 40 = 275.
The answer: 275
Reverse engineering the question: Teresa scored 70 marks in science, 80 in music, 85 in social studies, and the physics exam, which was the hardest test that Teresa had ever taken in her entire life, she scored half as many marks as she scored in music. Calculate the total marks Teresa scored in all the subjects.

Tina has 5 - 2 = 3 oranges. Tina has 17 - 10 = 7 tangerines. Tina has 7 - 3 = 4 more tangerines than oranges.
The answer: 4
Reverse engineering the question: Tina's bag contains nine apples, 5 oranges, and 17 tangerines. If she took away 2 oranges and 10 tangerines, how many more tangerines than oranges would she have left?

First find the total number of stocking stuffers one kid gets: 4 candy canes + 2 beanie babies + 1 book = 7 stocking stuffers. Then multiply the number of stocking stuffers per kid by the number of kids to find the total number: 7 stocking stuffers / kid * 3 kids = 21 stocking stuffers.
The answer: 21
Reverse engineering the question: Hannah fills her kids' stockings with 4 candy canes, 2 beanie babies and 1 book. If she has 3 kids, how many stocking stuffers does she buy total?

Bess produces 2 pails every day. Brownie produces 3 times as much * 2 = 6 pails every day. Daisy produces 2 + 1 more pail than Bess = 3 pails every day. Bess, Brownie, and Daisy together produce 2 + 6 + 3 = 11 pails every day. A week is 7 days, so Farmer Red gets 11 * 7 = 77 pails each week.
The answer: 77
Reverse engineering the question:
Farmer Red has three milk cows: Bess, Brownie, and Daisy. Bess, the smallest cow, gives him two pails of milk every day. Brownie, the largest cow, produces three times that amount. Then Daisy makes one pail more than Bess. How many pails of milk does Farmer Red get from them each week?