Officer (Freedom Fighter) 2019[MCQ]

46. There are n students in a school. If r% among the students are 12 years or younger, which of the following expressions represents the number of students who are older than 12?

[Officer (Freedom Fighter) 2019[MCQ] : 2019]

1. n(1 – r)

2. n(100–r)/100

3. n(1 – r)/100

4. 100(1 – r)n

Answer

47. 125 gallons of a mixture contains 20% water. What amount of additional water should be added such that water content be raised to 25%?

[Officer (Freedom Fighter) 2019[MCQ] : 2019]

1. 15/2 gallons

2. 17/2 gallons

3. 19/2 gallons

4. 8 1/3 gallons

Answer

48. The sum of squares of two numbers is 80 and the square of difference between the two numbers is 36. Find the product of two numbers.

[Officer (Freedom Fighter) 2019[MCQ] : 2019]

1. 11

2. 22

3. 33

4. 26

Answer

49. A student loses 1 mark for every wrong answer and scores 2 marks for every correct answer. If he answers all the 60 questions in an exam and score 39 marks, how many of them were correct?

[Officer (Freedom Fighter) 2019[MCQ] : 2019]

1. 27

2. 31

3. 33

4. 37

Answer

50. There are two stations of length 162 meters and 120 meters respectively. A train takes 15 seconds to pass first station and 18 seconds to pass another station. Determine the length of the train?

[Officer (Freedom Fighter) 2019[MCQ] : 2019]

1. 90 m

2. 70 m

3. 100 m

4. 95 m

Answer

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