Goldie did pet - sitting for a total of 20 + 30 = 50 hours. So, she earned a total of $5 x 50 = $250.
The answer: 250
Reverse engineering the question: Goldie makes $5 an hour for pet-sitting. Last week, she worked for 20 hours while this week, she worked for 30 hours. How much did Goldie earn in two weeks for pet-sitting?

Monday:14. Tuesday:14 / 2 = 7. Wednesday:4(7) = 28. Total:14 + 7 + 28 = 49 donuts.
The answer: 49
Reverse engineering the question: Andrew eats 14 donuts on Monday, and half as many on Tuesday. On Wednesday Andrew eats 4 times as many as he did on Monday. How many donuts did Andrew eat total in the three days?

Allie has 9 - 1 = 8 toys of the same value. Without the value of the one $12 toy, all 8 other toys are worth in total 52 - 12 = $40. That would mean, that one of the other toys is worth 40 / 8 = $5.
The answer: 5
Reverse engineering the question: Allie has 9 toys, which are in total worth $52. If we know that one toy is worth $12, and all the other toys have the same value, how much does one of the other toys cost?

He consumed 2500 calories, 5% of which is added sugar to give 2500 * (5 / 100) = 125 calories of added sugar. He exceeded the recommended intake of 150 calories by 100% for a total consumption of 150 + (150(100 / 100)) = $300. This means he took in 300 - 125 = 175 calories from candy alone. Each candy had 25 calories so 175 calories which means he consumed 175 / 25 = 7 bars?.
The answer: 7
Reverse engineering the question:
It is recommended that men should consume no more than 150 calories of added sugar per day. Mark took a soft drink in the afternoon that contained 2500 calories, 5% of which was from added sugar. Then he bought some bars of candy which had 25 calories of added sugar each. If he eventually exceeded the recommended intake of added sugar by 100%, how many bars of candy did he take?