Percentage – Set 6

1) A line of length 1.5 metres was measured as 1.55 metres by mistakes. What will be the value of error percent ?

3) A candidate who gets 20% marks in a examination fails by 30 marks but another candidate who gets 32% gets 42 marks more than the pass marks. Then the percentage of pass marks is :

4) In an examination there were 640 boys and 360 girls, 60% of boys and 80% of were successful. The percentage of failure was :

6) When the price of an article was reduce by 20%, its sale increased by 80%. What was the net effect on the sale ?

7) A number is increased by 15% and then decreased by 25% and the number becomes 22 less than the original number. The original number is :

10) A man gives 50% of his money to his son and 30% to his daughter. 80% of the rest is donate to a trust. If he is left with 16000 now, how much money did he have in the beginning ?

12) The ratio of number of boys and girls in a school 720 students is 7 : 5. How many more girls should be admitted to make the ratio 1 : 1 ?

13) In what ratio must a mixture of 30% alcohol strength be mixed with that of 50% alcohol strength so as get a mixture of 45% alcohol strength ?

16) The cost of an article worth Rs. 100 is increased by 10% first and again increased by 10%. The total increase in rupees is :

17) Two persons contested an election of Parliament. The winning candidate secured 57% of the total votes polled and won by a majority of 42000 votes. The number of total votes polled is :

18) On a certain date, Pakistan has a success rate of 60% against India in all the ODI’s played between the two countries. The lost the next 30 ODI’s. In a row to India and their success rate comes down to 30%. The total number of ODI’s played between the two countries is :

20) A sample of 50 litres of glycerine is found to be adulterated to the extent of 20%. How much pure glycerine should be added to it so as to bring down the percentage of impurity to 5% ?

21) A’s salary was decreased by 50% and subsequently increased by 50%. How much percent does he lose ?

22) A number, on subtracting 15 from it reduces to its 80%. What is 40% of the number ?

23) In an examination, 1100 boys and 900 girls appeared, 50% of the boys and 40% of the girls passed the examination. The percentage of candidates who failed :

24) In an examination A got 25% marks more than B, B got 10% less than C and C got 25% more than D. If D got 320 marks out of 500, the marks obtained by A were :

26) 25% of the candidates who appeared in an examination failed and only 450 students qualify the exam. The number of students who appeared in the examination was :

27) The ratio 5 : 4 expressed as a percent equals :

28) If 35% of A’s income is equal to 25% of B’s income, then the ratio of A’s income to B’s income is :

29) If the duty on an article is reduced by 40% of his present rate by how much percent must its consumption increase in order that the revenue remains unaltered ?

30) The ratio of the number of boys and girls in school at 8 : 12. If 50% of boys and 25% of girls are getting scholarship for their studies, what is the percentage of school students who are not getting any scholarships ?

31) When 75 added to 75% of a number, the answer is the number. Find 40% of that number.

32) If 15% of (A + B) = 25% of (A – B), then what percent of B equal to A ?

34) A number is decreased by 10% and the resulting number is again decreased by 20%. What is the final percentage of decrease ?

35) 2 is what percent of 50 ?

37) If the numerator of a fraction is increased by 20% and the denominator is decreased by 5%, the value of the new fraction becomes 52“>5/2. The original fraction is :

38) In an election there were only two candidates. One of the candidate secured 40% of votes and is defeated by the other candidate by 298 votes. The total number of votes polled is :

39) When 60% of a number is subtracted from another number, the second number reduces to its 52%, the ratio of the first number to the second number is :

40) The average marks obtained in a class of 50 students is 70%. The average of first 25 is 60% and that of 24 is 80%. What is the mark obtained by the last student ?

41) 15% of 45% of a number is 105.3. What is 24% of that number.

42) There is a ratio of 5 : 4 between two numbers. If 40% of the first number is 12, then what would be 50% of the second number ?

43) In a factory 60% of the workers are above 30 years and of these 75% are male and the rest are females. If there are 1350 male workers above 30 years, the total number of workers in the factory is :

44) What is the difference between 0.6 and 0.6% ?

45) A man spends a part of his monthly income and saves the rest. The ratio of his expenditure to the saving is 61 : 6. If his monthly income is Rs. 8710, the amount of his monthly savings is :

46) A reduction of 10% in the price of an apple enable a man to buy 10 apples more for Rs. 54. The reduced price of apples per dozen is :

47) Christy donated 10% of his income to an orphanage and deposited 20% of the remainder in his bank. If he has now Rs. 7200 left, what is his income :

48) A and B are two fixed points 5 cm apart and C is a point an AB such that AC is 3 cm. If the length of AC is increased by 6%, the length CB is decreased by :

49) If y% of one hour is, 1 minute 12 seconds, then y is equal to :