Q: Miranda wants to buy a pair of heels she saw online. She saved money for 3 months. Her sister heard that she was sad and gave her $50 for her to buy the heels. If she paid $260 in total for the heels, how much money did she save per month?
A: First find the total amount of money she saved: $260 - $50 = $210. Then divide that number by the number of months she saved to find the amount she saved each month: $210 / 3 months = $70 / month. The answer is 70.

Q: One necklace is worth $34. Bob decided to buy one for his wife. But, he also bought a book, which is $5 more expensive than the necklace. Before he went shopping, Bob set a limit and decided not to spend more than $70. How many dollars over the "limit" did Bob spend?
A: The book is $5 more expensive than the necklace, which means the book costs 34 + 5 = $39. Both products which Bob wants to buy cost in total 39 + 34 = $73. So Bob will spend 73 - 70 = $3 over the limit. The answer is 3.

Q: Harry is joining a marathon that's why he practices and varies his workouts from day to day. He ran 10 meters per hour on Monday. From Tuesday to Thursday he ran 50% faster than on Monday. Then on Friday, he ran 60% faster than he ran on Thursday. How fast did Harry run on Friday?
A:
Harry ran 10 x 50 / 100 = 5 meters per hour faster on Tuesday to Wednesday. So he ran 10 + 5 = 15 meters per hour from Tuesday to Thursday. Then on Friday, he ran 15 x 60 / 100 = 9 meters per hour more. Therefore, he ran 15 + 9 = 24 meters per hour on Friday. The answer is 24.