[Question]After a trip, Mrs. Nalani took the students to the restaurant and told them they could order either a burger or a hot dog. If the number of students who ordered burgers was 30, twice the number of students who called for a hot dog, calculate the number of students at the restaurant.
[Answer]If the 30 students who ordered burgers were twice the number of students who ordered hot dogs, then 30 / 2 = 15 students ordered hot dogs. The total number of students is 15 + 30 = 45. The answer is 45.
Q: Tom turned 32 years old 5 years ago. 7 years ago Jim was 5 years older than half Tom's age. How old is Jim in 2 years?
A: Tom is 32 + 5 = 37 years old. So 7 years ago he was 37 - 7 = 30 years old. Half of his age was 30 / 2 = 15 years old. So 7 years ago Jim was 15 + 5 = 20. So he is now 20 + 7 = 27 years old. That means in 2 years he will be 27 + 2 = 29 years old. The answer is 29.
Question: The tank of John's car is full: it contains 47 liters of gasoline. After a journey of 275 km, there are 14 liters left. What is the fuel consumption of this car per 100 km?
Answer: The car consumed 47 liters - 14 liters = 33 liters of gasoline for 275 km. Let x be the fuel consumption per 100 km. We can write the proportion: 33 / 275 = x / 100. The cross product gives: 275 x = 33 * 100. So the car consumes x = 3300 / 275 = 12 liters per 100 km. The answer is 12.
[Question]Mike decides to do more pull-ups to increase his strength for climbing. He uses the greasing the groove technique where every time he goes into a certain room he does 2 pull-ups. He decides to use his office. He goes in there 5 times a day every day. How many pull-ups does he do a week?
[Answer]He does 5 * 2 = 10 pull - ups a day. So he does 10 * 7 = 70 pull - ups a week. The answer is 70.
Q: Avery puts 4 shirts in the donation box. He adds twice as many pants as shirts in the box. He throws in half as many shorts as pants in the box. In total, how many pieces of clothes is Avery donating?
A: The total number of shirts in the donation box is 4. The total number of pants in the donation box is 4 x 2 = 8. The total number of shorts in the donation box is 8 / 2 = 4. The total number of clothes donated is 4 + 8 + 4 = 16 pieces. The answer is 16.
Question: A group of six friends planned to buy a car. The cost of the car is $1700 and they plan to share the cost equally. They had a car wash to help raise funds, which would be taken out of the total cost. The remaining cost would be split between the six friends. At the car wash, they earn $500. However, Brad decided not to join in the purchase of the car. How much more does each friend have to pay now that Brad isn't participating?
Answer:
Start by finding the total that is left, $1700 car price - $500 earned at car wash = $1200 remaining. So the six friends should pay $1200 / 6 people = $200 each. Since Brad is not joining, then the 5 friends have to split Brad's share which is $200 / 5 = $40 each. The answer is 40.