Problem: There were nine computers in the server room. Five more computers were installed each day, from monday to thursday. How many computers are now in the server room?
Solution: There are 4 days from monday to thursday. 5 computers were added each day. That means in total 4 * 5 = 20 computers were added. There were 9 computers in the beginning, so now there are 9 + 20 = 29 computers.
Equation: 4 * 5 = 20. 9 + 20 = 29.
Answer: 29