If 8 carpenters can make 50 chairs in 10 days, how many carpenters are needed to make 75 chairs in 10 days? Give the rationale and then the answer.
Let's think step by step. The carpenters need to produce 75 / 50 = 1.5 times as many chairs in the same number of days. It will require 1.5 times as many carpenters to produce the extra chairs, so 8 * 1.5 = 12 carpenters will be required.. The answer is: 12.

Randy drew 5 pictures. Peter drew 3 more pictures than Randy. Quincy drew 20 more pictures than Peter. How many pictures did they draw altogether? Give the rationale and then the answer.
Let's think step by step. Peter drew 5 + 3 = 8 pictures. Quincy drew 20 + 8 = 28 pictures. Altogether they drew 5 + 8 + 28 = 41 pictures.. The answer is: 41.

Tim owns rental properties. He decides to replace all the locks and needs to get 3 keys per lock. He owns two apartment complexes which each have 12 apartments. How many keys does he need to make? Give the rationale and then the answer.
Let's think step by step. There are 2 * 12 = 24 apartments he needs keys for. So he needs 24 * 3 = 72 keys.. The answer is: 72.