Question: Darlene's car gets 20 miles/gallon. Martha's car gets half as many miles per gallon as Darlene's car. How many gallons does Martha's car require to make a 300-mile trip?
Answer: Martha's car gets 20 / 2 = 10 miles per gallon. Total gallons Martha's car requires is 300 / 10 = 30 gallons. The answer is 30.

Question: Harry has 50 books in his library. His sister Flora has twice as many books and their cousin Gary has half the books Harry has. How many books do the three of them own together?
Answer: Flora has 50 * 2 = 100 books. Gary has 50 / 2 = 25 books. Together they own 100 + 25 + 50 = 175 books. The answer is 175.

Question: An internet provider gives a 5% discount if the customer pays before the 25th day of the month. If the monthly internet rate is $50, how much did the customer pay in all for 4 months if he paid every 25th of the month?
Answer: The 5% discount amounts to $50 x 5 / 100 = $2.50. So the total discount given to the customer for 4 months was $2.50 x 4 = $10. The customer was supposed to pay $50 x 4 = $200 in all for 4 months without discount. Since the customer is entitled to the discount, then he only paid a total of $200 - $10 = $190 for 4 months. The answer is 190.

Question: A special school has a deaf-student population 3 times its blind-student population. If there are 180 students in total, how many blind students are there?
Answer:
Let the number of blind students be x. The number of deaf students will then be 3 * x = 3x students. The total number of students is x + 3x = 180 students. Combining like terms gives 4x = 180. So the value of x is 180 / 4 = 45. The answer is 45.