So far, Mary has paid back $15 + $23 = $38 of the credit. So she still needs to pay $100 - $38 = $62.
The answer: 62
Reverse engineering the question: Mary does her grocery shopping on Saturday. She does her shopping only at a specific store where she is allowed a credit of $100, which must be paid in full before her next shopping trip. That week she spent the full credit limit and paid $15 of it on Tuesday and $23 of it on Thursday. How much credit will Mary need to pay before her next shopping trip?


Reasoning and answer: On Saturday, Erica saw 3 + 2 = 5 animals. On Sunday she spotted 2 + 5 = 7 animals. On Monday, she saw 5 + 3 = 8 animals. Adding up all the animals Erica saw gives a total of 5 + 7 + 8 = 20 animals.
The answer: 20
What was the question?
Question: Erica is telling her grandson about the animals she saw during her recent safari in Kenya's Maasai Mara. On Saturday, she saw 3 lions and 2 elephants. She spotted 2 buffaloes and 5 leopards on Sunday, and 5 rhinos and 3 warthogs on Monday. What is the total number of animals that Erica saw?


Jim has 30 + 20 = 50 toads. Sarah has 50 * 2 = 100 toads.
The answer: 100
Reverse engineering the question: Tim has 30 toads. Jim has 20 more toads than Tim does. Sarah has twice as many toads as Jim does. How many toads does Sarah have?


Reasoning and answer: She loses 5 marbles because 25 x .2 = 5. She has 20 marbles after this because 25 - 5 = 20. Her friend gives her 40 marbles because 20 x 2 = 40. Adding those marbles to the 20 she had before, she ends up with 40 marbles + 20 marbles = 60 marbles.
The answer: 60
What was the question?
Question: Baez has 25 marbles. She loses 20% of them one day. Then a friend sees her and gives her double the amount that Baez has after she lost them. How many marbles does Baez end up with?


Monday, Wednesday, and Friday, Harry walks a total of 3 * 7 = 21 dogs. Thus, in a week he walks 21 + 12 + 9 = 42 dogs. At a rate of $5 per dog, Harry ears $5 * 42 = $210 per week.
The answer: 210
Reverse engineering the question: Harry is a professional dog-walker. He is paid to go on long walks with dogs while their families are away from home. On Monday, Wednesday, and Friday, Harry walks 7 dogs. On Tuesday, he walks 12 dogs. And on Thursday he walks 9 dogs. He is paid $5 for each dog that he walks. How many dollars does Harry earn in a week?


On Monday there are 20 / 100 * 25 = 5 cars passing the street less than on Tuesday. So on Monday, there are 25 - 5 = 20 cars on Happy Street. On Wednesday, there are 20 + 2 = 22 cars on this street. On Thursday and Friday, there is a total of 10 * 2 = 20 cars passing. On the weekend 5 * 2 = 10 cars are passing. So from Monday through Sunday, there are 20 + 25 + 22 + 20 + 10 = 97 cars traveling down the street.
The answer: 97
Reverse engineering the question:
There is very little car traffic on Happy Street. During the week, most cars pass it on Tuesday - 25. On Monday, 20% less than on Tuesday, and on Wednesday, 2 more cars than on Monday. On Thursday and Friday, it is about 10 cars each day. On the weekend, traffic drops to 5 cars per day. How many cars travel down Happy Street from Monday through Sunday?