Q: A mathematician is working on two projects. He has one week to write 518 maths questions for one project and 476 questions for another project. If he completes the same number of questions every day, how many should he aim to complete each day?
A: The writer is going to write 518 questions + 476 questions = 994 questions in 7 days. He should aim to do 994 questions ÷ 7 days = 142 questions / day. The answer is 142.

Q: The cost of a slice of cake is three-fourths of the cost of a cup of milk tea. If the milk tea costs $2.40, how much do 2 slices of cake and 1 cup of milk tea cost?
A: The cost of a slice of cake is $2.40 x 3 / 4 = $1.80. So, 2 slices of cake cost $1.80 x 2 = $3.60. Therefore, 2 slices of cake and 1 cup of milk tea cost $3.60 + $2.40 = $6. The answer is 6.

Q: Susan, Arthur, Tom and, Bob are siblings. Arthur is 2 years older than Susan, and Tom is 3 years younger than Bob. If Bob is 11 years old, and Susan is 15 years old, how old are all four family members in total?
A:
Arthur is 2 years older than Susan, so he is 15 + 2 = 17 years old. Bob is 11 years old, so Tom is 11 - 3 = 8 years old. So in total these four family members have 11 + 15 + 17 + 8 = 51 years. The answer is 51.