[Question]Dr. Jones earns $6,000 a month. His house rental is $640 each month; his monthly food expense is $380; his electric and water bill costs 1/4 of what he makes, and his insurances cost 1/5 of what he makes. How much money does he have left after paying those four bills?
[Answer]Dr. Jones pays $6000 / 4 = $ 1500 for his electric and water bill. He pays $6000 / 5 = $1200 for his insurances. The total amount he pays for the bills and insurances is $1500 + $1200 = $2700. The remaining money from his earning after paying off the bills and insurance is $6000 - $2700 = $3300. The total amount he needs to pay for the rent and food expenses is $640 + $380 = $1020. So, Dr. Jones has $3300 - $1020 = $2280 left. The answer is 2280.
Q: A class of 12 students was about to share 108 oranges equally among themselves when it was discovered that 36 of the oranges were bad and had to be thrown away. How many oranges less will each student get now than if no orange had to be thrown away?
A: If the 12 students had shared the 108 oranges, each student would have gotten 108 / 12 = 9 oranges. But 36 were removed so there are 108 - 36 = 72 oranges left. So 12 shared 72 for each to get 72 / 12 = 6 oranges. This is 9 - 6 = 3 less than they would each get if they did not have to throw any orange away. The answer is 3.
Question: Mark and his sister Chris both leave their house for school at the same time. Mark travels at the same speed as Chris, who walks 3 miles per hour. After walking 3 miles Mark has to turn around and go home because he forgot his lunch. If the distance from their house to the school is 9 miles, how much longer does Mark spend walking than Chris?
Answer: First find the total number of miles Mark walks to get his lunch by multiplying the distance he walks back to the house by 2: 3 miles * 2 = 6 miles. Then find the total distance Mark walks by adding that distance to the distance between the house and the school: 6 miles + 9 miles = 15 miles. Now divide the total distance Mark walks by his speed to find how many hours he spends walking: 15 miles / 3 miles / hour = 5 hours. Now divide the total distance Chris walks by her speed to find the total time she spends walking: 9 miles / 3 miles / hour = 3 hours. Now subtract the time Chris spends walking from the time Mark spends walking to find the difference: 5 hours - 3 hours = 2. The answer is 2.
[Question]A teacher has to order supplies for his class to do a science project. Each student needs a bow, a small bottle of vinegar and a box of baking soda. Bows are $5 each, a bottle of vinegar is $2 and a box of baking soda is $1. The teacher has 23 students in this class. How much will the supplies cost?
[Answer]The supplies for every student will cost 5 + 2 + 1 = $8. The supplies for the whole class will cost 8 * 23 = $184 in total. The answer is 184.
Q: Gabby is saving money to buy a new makeup set. The makeup set costs $65 and she already has $35. Gabby’s mom gives her an additional $20. How much money does Gabby need to buy the set?
A: Deduct the amount saved from the total cost of the set. $65 - $35 = $30. Deduct the amount of money Gabby received from her mom. $30 - $20 = $10. The answer is 10.
Question: In a triangle with angles A, B, and C, A is 60 degrees, and B is two times as big as C. Calculate the angle of B.
Answer:
Since the angles in a triangle adds up to 180, and A is 40 degrees, B and C have a total of 180 - 60 = 120 degrees. Since B is two times bigger than C, the total of the angles of B and C is equal to 2C + C = 120. 3C = 120. The angle of C is C = 120 / 3. C is 40. Since B is two times as big as C, B is 2 * 40 = 80 degrees. The answer is 80.