Step-by-step reasoning process: If the son is going to be eight years old after a year from now, then currently, he is 8 - 1 = 7. Since the father's age is five times that of the son, currently he is 5 * 7 = 35 years old.
The question and answer:
Question and answer: My age is five times that of my son. Next year, my son will be eight years old. How old am I now?
The answer is 35

Step-by-step reasoning process: It will take 1.5 days x 2 = 3 days to explore 2 islands. So, the pirates will walk 20 miles x 3 days = 60 miles to explore two islands. The other 2 islands will be explored by walking 25 miles x 3 days = 75 miles. Thus, the pirates will need to walk 60 + 75 = 135 miles to explore the 4 islands.
The question and answer:
Question and answer: The pirates plan to explore 4 islands. Two islands require walking 20 miles per day while the other two islands require 25 miles per day. How many miles will they have to walk if it takes 1.5 days to explore each island?
The answer is 135

Step-by-step reasoning process: Two hamburger cost 2 x $2 = $4. So, Andy spent $1 + $4 = $5. Therefore, Bob's fruit drink cost $5 - $3 = $2.
The question and answer:
Question and answer:
Andy and Bob went to the canteen to buy snacks. They spent the same amount. Andy bought a can of soda at $1 and two hamburgers at $2 each. Bob ordered two sandwiches for $3 and a can of fruit drink. How much did Bob's fruit drink cost?
The answer is 2