Question: Karina was born in 1970 and she is currently twice as old as her brother. If her current age is 40, in what year was her brother born?
Answer: If Karina is currently 40, and she is twice as old as her brother, then her brother is currently 40 / 2 = 20 years old. If Karina was born in 1970, then her brother was born in 1970 + 20 = 1990. The answer is 1990.
[Question]Lillian went out to forage for mushrooms with her handy guidebook. She found 32 mushrooms and used her guidebook to identify which ones were poisonous and which were safe to eat. In the end, she had 9 mushrooms she could safely eat for dinner. Of the rest, she identified twice the amount she ate as poisonous, and a remaining bunch she was uncertain about. How many mushrooms was she uncertain were safe or poisonous?
[Answer]Lillian found 9 of the mushrooms were safe, so there were 32 - 9 = 23 that she found poisonous or uncertain. She knew twice the amount she ate were poisonous, so she found 9 * 2 = 18 poisonous mushrooms. Thus, she was uncertain about 23 - 18 = 5 mushrooms. The answer is 5.
Q: A truck can carry a maximum of 13,500 kgs of supplies. Yesterday, the truck was loaded with 100 boxes that weigh 100 kgs each. Then, it was loaded with 10 crates which weigh 60 kgs each. Today, it was loaded again with 50 sacks which weigh 50 kilograms each. How many bags weighing 40 kilograms each can we still load in the truck?
A: The total weight of the boxes is 100 boxes x 100 kg / box = 10 000 kg. The total weight of the crates is 10 crates x 60 kg / crate = 600 kg. The total weight of the sacks is 50 sacks x 50 kg / sack = 2 500 kg. So, the total weight of the supplies that were already loaded is 10,000 kg + 600 kg + 2500 kg = 13,100 kg. Hence, the most weight that can still be loaded in the truck is 13,500 kg - 13,100 kg = 400 kg. This means 400 kg / 40 kg / bag = 10 bags can still be loaded in the truck. The answer is 10.
Question: Gwendolyn can read 200 sentences of a book in 1 hour. She just brought a book from the library, having 20 paragraphs per page. What's the total time Gwendolyn will take to read the book if each paragraph has 10 sentences and the book has 50 pages?
Answer: Gwendolyn just brought a book from the library, having 20 paragraphs per page, and since the book has 50 pages, the number of paragraphs in the book is 50 * 20 = 1000 paragraphs. If each paragraph has 10 sentences, the book's number of sentences is 1000 * 10 = 10000 sentences. Since Gwendolyn can read 200 sentences of a book in 1 hour, she will read 10000 sentences in 10000 / 200 = 50 hours. The answer is 50.
[Question]Elisa and her two friends went out to dinner. Each of them ordered a meal worth $10. Afterwards, they each had a scoop of the same kind of ice cream. If the $45 Elisa had was enough to pay for everything, what was the cost of a scoop of ice cream?
[Answer]The three friends had meals worth 10 * 3 = 30 dollars. If they paid for the meals only, they would have remained with 45 - 30 = 15 dollars. Dividing the remaining amount by the number of ice cream scoops gives 15 / 3 = 5 dollars. Each scoop of ice cream cost 5 dollars. The answer is 5.
[Question]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?
[Answer]
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.