John gave his fiancee a $4000 ring on their engagement day, a $2000 car as a gift on their wedding day, and a diamond brace twice as expensive as the ring he gave her during the engagement. What's the worth of the presents John gave to her fiancee? Give the rationale and then the answer.
Let's think step by step. If John gave his fiancee a $4000 ring on their engagement day, a $2000 car as a gift on their wedding day, the total cost for the two presents is $4000 + $2000 = $6000. He also gave his fiancee a diamond brace twice as expensive as the ring costing 2 * $4000 = $8000. The total worth of the presents John gave to his fiancee is $6000 + $8000 = $14000.. The answer is: 14000.

Jebb buys $50 worth of food at a restaurant with a service fee of 12%. After paying, he gives a $5 tip. How much money did he spend at the restaurant? Give the rationale and then the answer.
Let's think step by step. Jebb paid $50 x 12 / 100 = $6 for service fee. He paid $50 + $6 = $56 for the food and the service fee. The total cost of everything is $56 + $5 = $61.. The answer is: 61.

There are 235 books in a library. On Tuesday, 227 books are taken out. On Thursday, 56 books are brought back and 35 books are taken out again on Friday. How many books are there now? Give the rationale and then the answer.
Let's think step by step. On Tuesday, 227 books were taken, so there are 235 - 227 = 8 books left. 56 books were brought back on Thursday, so there are 8 + 56 = 64 books in the library. Finally, 35 books are taken out on Friday, leaving 64 - 35 = 29 books available.. The answer is: 29.