Q: Toby is filling his swimming pool for the summer. The pool normally takes 50 hours to fill. He knows his hose runs at 100 gallons per hour. Water costs 1 cent for 10 gallons. How many dollars does it cost to fill the pool?
A: The pool holds 5000 gallons of water because 50 x 100 = 5000. Every gallon costs $.001 because $.01 / 10 = $.001. It costs $5 to fill the pool because 5000 x $.001 = $5. The answer is 5.
Question: Johnny is an engineer designing a bridge. The roadway deck for the top of the bridge needs 1600 tons of concrete to construct. The two bridge anchors need equal amounts of concrete, but only one has been built so far, using 700 tons of concrete. Johnny had to calculate how many tons of concrete the supporting pillars underneath the bridge would need, and he found that the total amount of concrete in the entire bridge will be 4800 tons. How much concrete did Johnny find he needs for the supporting pillars?
Answer: The bridge anchors will take 700 * 2 = 1400 tons of concrete. The roadway deck and bridge anchors need 1600 + 1400 = 3000 tons of concrete. Thus, Johnny found the supporting pillars need 4800 - 3000 = 1800 tons of concrete. The answer is 1800.
[Question]Annie was given a pack of crayons. The pack contained 21 crayons. She already had a box of 36 crayons in her locker. Her friend Bobby gave her half the amount she already had in her locker. She decided to give her sister Mary 1/3 of her total amount of crayons. How many crayons does she give to Mary?
[Answer]Annie starts with 21 + 36 = 57 crayons. Bobby ends up giving her 36 / 2 = 18 crayons. Annie now has a total of 57 + 18 = 75 crayons. She ends up giving Mary a total of 75 * (1 / 3) = 25 crayons. The answer is 25.
Q: A magician has a top hat with 20 red marbles and a top hat with 30 blue marbles. If he takes away 3 red marbles and four times as many blue marbles as red marbles (without looking), how many marbles in total does he have left?
A: He had 20 red marbles and took away 3 leaving 20 - 3 = 17 red marbles. He took 4 times as many blue marbles as red marbles which is 4 * 3 = 12 blue marbles. He took 12 blue marbles from 30 leaving 30 - 12 = 18 blue marbles. He now has 17 + 18 = 35 marbles left. The answer is 35.
Question: Debelyn, Christel, and Andrena collect dolls. Debelyn had 20 dolls before she gave Andrena 2 dolls. Christel had 24 dolls before giving Andrena 5 dolls. After all the gifts, Andrena now has 2 more dolls than Christel, how many more dolls does andrena have now than Debelyn?
Answer: Debelyn had 20 - 2 = 18 dolls left after giving out 2 dolls to Christel. Christel had 24 + 2 = 26 dolls after receiving 2 dolls from Debelyn. Christel had 24 - 5 = 19 dolls after giving Andrena 5 dolls. So, Andrena has 19 + 2 = 21 dolls now. Therefore, Andrena has 21 - 18 = 3 more dolls than Debelyn. The answer is 3.
Q: Mary sees a flock of ducks crossing the street. There are 2 ducks with 5 ducklings each, 6 ducks with 3 ducklings each, and 9 ducks with 6 ducklings each. How many ducks and ducklings are there total?
A:
First find the total number of ducklings the first two ducks have: 2 ducks * 5 ducklings / duck = 10 ducklings. Then find the total number of ducklings the next six ducks have: 6 ducks * 3 ducklings / duck = 18 ducklings. Then find the total number of ducklings the last 9 ducks have: 9 ducks * 6 ducklings / duck = 54 ducklings. Then add up all the ducks and ducklings to find the total number: 10 ducklings + 18 ducklings + 54 ducklings + 2 ducks + 6 ducks + 9 ducks = 99 ducks. The answer is 99.