Question: Mr. Manuel is a campsite manager who's been tasked with checking the number of tents set up in the recreation area. On a particular day, he counted 100 tents in the northernmost part of the campsite and twice that number on the east side of the grounds. The number of tents at the center of the camp was four times the number of tents in the northernmost part of the campsite. If he also counted 200 tents in the southern part of the campsite, what is the total number of tents in the recreation area?
Answer: On the eastern part of the campsite, Mr Manuel counted 2 * 100 = 200 tents. The total number of tents in the eastern and the northern part of the campgrounds is 200 + 100 = 300. There are four times as many tents as the northernmost part in the central part of the campsite, which means there are 4 * 100 = 400 tents in the central part of the camp. The total number of tents in the three parts of the campsite is 400 + 300 = 700. If you add the number of tents Mr. Manuel counted at the southern part of the campsite, you get 700 + 200 = 900 tents on the whole campsite. The answer is 900.

Question: An amusement park sells tickets for $3. This week it welcomed 100 people per day but on Saturday it was visited by 200 people and on Sunday by 300. How much money did it make overall in a week?
Answer: During the weekdays it was visited by 100 * 5 = 500 people. On Sunday and Saturday, it was visited by 200 + 300 = 500 people. In total 500 + 500 = 1000 people visited the park in a week. So it earned 1000 * 3 = 3000 dollars in a week. The answer is 3000.

Question: Darwin has 600$. He spent 1/3 of it on gas for his car, and 1/4 of what was left on food. How much money did he have left?
Answer: 600 / 3 = 200$ for gas. After buying gas, Darwin has 600 - 200 = 400$ left. 400 / 4 = 100$ on food. Darwin has 400 - 100 = 300$ left. The answer is 300.

Question: Jerry needs to shingle 3 roofs. Each roof is made of two slanted rectangular sides measuring 20 feet by 40 feet. If he needs 8 shingles to cover one square foot of roof, how many shingles does he need total?
Answer:
First find the area of one side of a roof: 20 feet * 40 feet = 800 square feet. Then multiply that number by 2 to find the total area of both sides of the roof: 800 square feet / side * 2 sides = 1600 square feet. Then multiply that number by the number of roofs to find the total area of all the roofs: 1600 square feet / roof * 3 roofs = 4800 square feet. Then multiply the total area of the roofs by the number of shingles needed per square foot to find the total number of shingles needed: 4800 square feet * 8 singles / square foot = 38400 shingles. The answer is 38400.