Answer the following question.
A hotel had operations expenses totaling $100. If the hotel received clients whose total payments for services offered totaled 3/4 of the cost of the operations, calculate the loss the hotel incurred.
Step-by-step reasoning process: The total payment from the clients who used the hotel's services is 3 / 4 * 100 = $75. The hotel incurred a loss of $100 - $75 = $25.
The answer is 25.

Answer the following question.
A notebook costs three times as much as a pen. If a pen costs $1.50, how much will Lyle pay for 4 notebooks?
Step-by-step reasoning process: A notebook costs $1.50 x 3 = $4.50. So Lyle will pay $4.50 x 4 = $18 for the 4 notebooks.
The answer is 18.

Answer the following question.
John takes a pill every 6 hours. How many pills does he take a week?
Step-by-step reasoning process: He takes 24 / 6 = 4 pills a day. So he takes 4 * 7 = 28 pills a week.
The answer is 28.

Answer the following question.
Selena reads a book with 400 pages. Harry reads a book with 20 fewer than half the number of pages Selena's book has. How many pages are in the book of Harry?
Step-by-step reasoning process: Half the number of pages of Selena is 400 / 2 = 200. Therefore, Harry's book has 200 - 20 = 180 pages.
The answer is 180.