Question: John wants to lose weight. He eats 1800 calories a day and burns 2300 a day. If he needs to burn 4000 calories to lose 1 pound how many days will it take to lose 10 pounds?
Answer: He burns 2300 - 1800 = 500 calories a day. He needs to burn 4000 * 10 = 40,000 calories to hit his goal. That means it will take him 40,000 / 500 = 80 days. The answer is 80.

Question: Blake goes to the grocery store and spends $40 on oranges, $50 on apples, and $60 on mangoes. If he has $300, how much change was he given?
Answer: The total costs for the fruits is $40 + $50 + $60 = $150. The amount of money given as change is $300 - $150 = $150. The answer is 150.

Question: There are 19 marbles in a bowl, 5 of which are yellow. The remainder are split into blue marbles and red marbles in the ratio 3:4 respectively. How many more red marbles than yellow marbles are there?
Answer: 5 out of 19 marbles are yellow so the remainder which is 19 - 5 = 14 marbles are blue and red. 14 marbles are split into blue and red in the ratio 3:4 so each "share" is 14 / (3 + 4) = 2 marbles. There are 4 "shares" of red marbles which totals to 4 * 2 = 8 red marbles. There are 8 - 5 = 3 more red marbles than yellow marbles. The answer is 3.

Question: Julieta went to the store to buy a backpack and three ring-binders for her school supplies. She knew the backpack was $50, and each ring-binder cost was $20. However, at the store, she found out that the price of a back had increased by $5, and the price of a ring-binder had reduced by $2. Calculate the total amount of money Julieta spent at the store.
Answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Initially, a backpack cost was $50; when it increased by $5, the price became $50 + $5 = $55. The price of a ring - binder $20, when it reduced by $2, the price became $20 - $2 = $18. If she wanted to buy 3 ring - binders, she spent $18 * 3 = $54. In total, Julieta spent $55 + $54 = $109. The answer is 109.