Q: A mountain range has 200 active volcanoes. In a particular year, 20% of the volcanoes exploded in the first two months, 40% of the remaining exploded by the half of the year, and at the end of the year, another 50% of the volcanoes that hadn't already erupted also exploded. How many mountains are still intact at the end of the year?
A: By the first two months, 20 / 100 * 200 = 40 mountains had erupted. The total number of mountains remaining after the first round of explosions is 200 - 40 = 160. When 40% of the remaining mountains exploded, the number of mountains that were still intact decreased by 40 / 100 * 160 = 64. The number of mountains that hadn't exploded after the second explosions is 160 - 64 = 96. When 50% of the mountains which were still intact exploded, the number of mountains that hadn't erupted was reduced by 50 / 100 * 96 = 48. At the end of the year, 96 - 48 = 48 mountains remained intact and hadn't exploded. The answer is 48.
Question: My brother and I have thirty minutes to go to school, without being late. It takes us 15 minutes to arrive at the school gate, and another 6 minutes to get to the school building. How much time do we have to get to our room, without being late?
Answer: The total time we spent going to school is 15 minutes + 6 minutes = 21 minutes. We have 30 minutes - 21 minutes = 9 minutes left not to be late. The answer is 9.
[Question]Tony has a bucket that holds 2 pounds of sand. He has a sandbox out back that is two feet deep, four feet wide, and 5 feet long. A cubic foot of sand weighs 3 pounds. Because it's hot outside, he wants to make sure he stays hydrated, so every 4 trips he takes he drinks 3 ounces of bottled water. A 15 ounce bottle of water costs $2. He has $10 with him. How much change will he have after he buys all the water he needs?
[Answer]The sandbox is 40 cubic feet because 2 x 4 x 5 = 40. He needs 120 pounds of sand because 40 x 3 = 120. He will take 60 trips because 120 / 2 = 60. He will need to drink water 15 times because 60 / 4 = 15. He will drink 45 ounces of water because 15 x 3 = 45. He will need 3 bottles of water because 45 / 15 = 3. He will spend $6 on water because 3 x 2 = 6. He will have $4 in change because 10 - 6 = 4. The answer is 4.
Q: Ravi has some coins. He has 2 more quarters than nickels and 4 more dimes than quarters. If he has 6 nickels, how much money does he have?
A: Ravi has 6 + 2 = 8 quarters. He has also 8 + 4 = 12 dimes. A nickel is worth 5 cents so Ravi's nickels amount to 6 x 5 = 30 cents. A quarter is worth 25 cents so his quarters amount to 8 x 25 = 200 cents. A dime is worth 10 cents so his dimes amount to 12 x 10 = 120 cents. therefore, Ravi has 30 + 200 + 120 = 350 cents. The answer is 350.
Question: Kira is making breakfast for herself. She fries 3 sausages then scrambles 6 eggs and cooks each item of food separately. If it takes 5 minutes to fry each sausage and 4 minutes to scramble each egg then how long, in minutes, did it take for Kira to make her breakfast?
Answer: The sausages take 5 minutes per sausage * 3 sausages = 15 minutes to cook. The eggs take 4 minutes per egg * 6 eggs = 24 minutes to cook. So in total, it takes 15 minutes for sausages + 24 minutes for eggs = 39 minutes to cook breakfast. The answer is 39.
Q: Gavin has had 4 dreams every day for a year now. If he had twice as many dreams last year as he had this year, calculate the total number of dreams he's had in the two years.
A:
Since a year has 365 days, if Gavin has been having 4 dreams every day for a year now, he has had 4 * 365 = 1460 dreams this year. Gavin had twice as many dreams last as he had this year, meaning he had 2 * 1460 = 2920 dreams last year. The total number of dreams he has had in the two years is 2920 + 1460 = 4380 dreams. The answer is 4380.