[Question]Rodney is a door-to-door salesman trying to sell home security systems. He gets a commission of $25 for each system he sells. He is canvassing a neighborhood of four streets with eight houses each. The first street gave him half the sales that the second street did, while every house on the third street turned him away and the fourth street resulted in only one sale. His total commission was $175. How many security systems did he sell on the second street?
[Answer]Let S be the number of systems Rodney sold on the first street. He sold 2S systems on the second street. Based on his commission, he sold 175 / 25 = 7 systems. In all, he sold S + 2S + 0 + 1 = 3S + 1 = 7 systems. On the first and second streets, he sold 3S = 7 - 1 = 6 systems. Thus, on the first street he sold S = 6 / 3 = 2 systems. On the second street, Rodney sold 2 * 2 = 4 security systems. The answer is 4.
Q: Emir wants to buy a dictionary that costs $5, a dinosaur book that costs $11, and a children's cookbook that costs $5. He has saved $19 from his allowance. How much more money does Emir need to buy all three books?
A: The total cost of the dictionary, the dinosaur book, and the cookbook is $5 + $11 + $5 = $21. Emir needs $21 − $19 = $2. The answer is 2.
Question: Samara and three of her friends heard alligators spotted on the local river and decided to join a search organized by the wildlife service to capture the animals. After searching the whole day, Samara had seen 20 alligators while her friends had seen an average of 10 alligators each. Calculate the total number of alligators Samara and her friends saw.
Answer: Each of Samara's friends saw an average of 10 alligators each, a total of 3 * 10 = 30 alligators. Together, Samara and her friends saw 30 + 20 = 50 alligators. The answer is 50.
[Question]A volcano erupts and spews ash into the sky. The ash cloud spreads out in a diameter eighteen times as far as the distance it shot up into the sky. If the ashes erupted three hundred feet into the sky, what was the radius of the ash cloud in feet?
[Answer]The ash cloud spread out 300 * 18 = 5400 feet in diameter. The radius is half the diameter, so the ash cloud had a radius of 5400 / 2 = 2700 feet. The answer is 2700.
Q: Marta works on her grandparent's farm to raise money for a new phone. So far, she has collected $240. For every hour she works, she receives $10. Her grandmother often gives her tips, and she has collected $50 in tips in total. How many hours has Marta worked on the farm so far?
A: Ignoring tips, Marta earned $240 - $50 = $190. Therefore, she has worked 190 / 10 = 19 hours. The answer is 19.
Question: There were 50 candies left in a bowl after Shelly ate 20 candies the previous week. Her friend comes over, bringing twice as much candy as she originally had. Shelly adds this to the bowl and they decide to divide them equally. How much candy did her friend have after eating 10 of her candies?
Answer:
The total number of candies Shelley had before eating some is 50 + 20 = 70 candies. When her friend came over, she brought 2 * 70 = 140 candies. The total number of candies in the bowl is now 140 + 50 = 190 candies. When they divide this equally between them, each gets 190 / 2 = 95 candies. When Shelly’s friend eats 10 of her candies, she still has 95 - 10 = 85 candies. The answer is 85.