Percentage (Railway Maths) (Part – IV)

Total Questions: 50

21. A student multiplied a number by 3/5 instead of 5/3. What is the percentage error in the calculation? [RRB NTPC 10/02/2021 (Evening) ]

Correct Answer: (d) 64%
Solution:

22. In an election between two candidates, 75% of the voters enrolled in the election cast their votes, out of which 2% were declared invalid. A candidate got 9261 votes, which were 75% of the valid votes. The total number of voters enrolled in that election were: [RRB NTPC 10/02/2021 (Evening)]

Correct Answer: (a) 16800
Solution:

23. An examination requires 33% marks in order to pass. A candidate who gets 210 marks fails by 21 marks. What are the total marks for the examination? [RRB NTPC 11/02/2021 (Morning)]

Correct Answer: (b) 700
Solution:

24. A man’s health insurance premium for last year was Rs 1,440 . If he paid Rs 1,512 this year, what is the percentage increase on his health insurance premium. [RRB NTPC 11/02/2021 (Evening) ]

Correct Answer: (a) 5%
Solution:

25. If the numerator of a fraction is decreased by 80% and the denominator of the fraction is decreased by 60%, then the resultant fraction is 5/6, what is the original fraction? [RRB NTPC 15/02/2021 (Morning) ]

Correct Answer: (b) 5/3
Solution:

26. In an examination, 45% of the students qualified and 79,750 are not qualified. How many students applied for the examination? [RRB NTPC 15/02/2021 (Evening)]

Correct Answer: (a) 145000
Solution:

27. Out of 500 students in a college, 350 play cricket, 125 play Kabaddi, 75 neither play cricket nor Kabaddi. Find the percentage of the number of students who play both Kabaddi and Cricket. [RRB NTPC 15/02/2021 (Evening)]

Correct Answer: (c) 10%
Solution:

28. If 30% of x is equal to five-sixth of y. Find x : y. [RRB NTPC 16/02/2021 (Morning)]

Correct Answer: (a) 25 : 9
Solution:

29. In the school, there were 1400 boys and 600 girls. 40% of girls and 60% of boys passed the examination. What is the percentage of failed candidates? [RRB NTPC 16/02/2021 (Morning)]

Correct Answer: (a) 46%
Solution:

30. If the cost price of an article is 40% of its selling price, then what percent is the selling price of its cost price? [RRB NTPC 16/02/2021 (Evening)]

Correct Answer: (a) 250%
Solution: