Step-by-step reasoning process: If there were 200 students on the field and 3 / 4 of the students looked up at the flying plane, 3 / 4 * 200 = 150 students saw the plane. Since each student has two eyes, the number of eyes that looked at the plane is 2 * 150 = 300 years.
[Q & A] The question is There were 200 students on a field playing football. Suddenly a military plane flew by, and 3/4 of the students looked up. How many eyes saw the airplane?
The answer is 300

Step-by-step reasoning process: There are 15 + 10 = 25 students in the class. 375 books were divided equally among them for a total of 375 / 25 = 15 books each. 15 girls will get a total of 15 * 15 = 225 books.
[Q & A] The question is There are 15 girls and 10 boys in Ms. Smith's class. She divided 375 books equally among them. How many books did all the girls get combined?
The answer is 225

Step-by-step reasoning process: Let's say the side of a square is s.To get the perimeter of a square, you add all the sides, which is s + s + s + s = 100. Therefore, 4s = 100. Therefore one side of the square is s = 100 / 4 = 25.
[Q & A] The question is While practising for his upcoming math exams, Hayes realised that the area of a circle he had just solved was equal to the perimeter of a square he had solved in the previous problem. If the area of the circle was 100, what's the length of one side of the square?
The answer is 25

Step-by-step reasoning process: Let X be the age of the older friend. The younger friend is X - 2 years old. So, the age of both is X + (X - 2) = 74. X + X = 74 + 2. 2 * X = 76. Then, the older friend is X = 38 years old.
[Q & A]
The question is The difference between the ages of two friends is 2 years. The sum of their ages is 74 years. Find the age of the older friend.
The answer is 38