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Percentage Classroom Exercise

2. Oil refining yields 28% kerosene. How much 13. Virat obtained 18% marks in an examination and
kerosene is obtained when refining 4000 tons he failed by 60 marks. If passing marks are
of oil? 33%, then total marks are……………
A. 350 b. 400 c. 450 d. 500
3. . Salim saves 14% of his salary while Manjur
saves 22%. If both get the same salary and 14. If a student score 36% marks then he is failed
Manjur saves Rs. 1540, then the savings and by 32 marks but when he score 48% marks he
salary of Salim is? . B.Des 2023 got 64 more than the pass marks. find the pass
marks. how much percent must its
4. Due to fall in rate of interest from 12% to 10.5% consumption be increased to keep the
p.a. simple interest a money lender’s income expenditure fixed
diminishes by Rs. 900. Find the capital.
B.Des 2023 15. When a student score 40% marks then he is
failed by 50 marks But when he score 50%
a. Rs. 40,00 b. Rs. 45,000 marks then he got 40 marks more than the
b. c. Rs. 55,000 d. Rs. 60,000 Passing marks. Find the passing percentage
5. If 16 ⅔ % of a no. is added to itself then the 16. A reduction of 20% in the price of wheat
result becomes 4956. Find the original number. enables a person to buy 5kg more wheat for
Rs. 320 . The original price of wheat was ?
6. If 12 ½ % of a number is 32. Find 40% of that
A. Rs. 16 b. Rs. 18
number. B.Des 2020
c. 20 d. 21
7. The income of C is 20% more than B’s and the
17. A reduction of 25% in the price of rice enables
income of B is 25% more than A’s. Find by what
Ramesh to buy two kg more rice for Rs. 240 .
percent C’s income more than A’s.
The reduced per kg price of rice is ?
8. If A exceeds B by 40% and B is less than C by A. Rs. 30 b. Rs. 25
20%. Then A:C=?
c. Rs. 20 d. Rs. 15
9. When 50 is added to 50% of a number , then the
18. Two numbers are less than by a third number
number becomes itself . find the number.2020
by 20% and 40%. By what % the second no.
10. A contractor pays 25% more to a male worker number is less than the first number ? By what
than what he pays to the female worker. How percentage first no. is is more than the second
much percent less does the contractor pay to number ?
the female worker than the male worker?
19. In an examination 93% students passed and 259
A. 20% B. 21% C. 22% D. 24% students failed. The total number of students
appeared in the exam ?
11. If A’s salary is 20% less than B’s salary, by
what percent is B’s salary more than A’s.

3rd Floor, Yasin Heritage, Behind Samrat Hotel, Near Dakbunglow Chowk, Fraser Road, Patna – 800001.
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20. In an election between two candidates , a 31. Fresh fruit contains 68% of water and dry fruit
candidate got 64% of the total votes and won by contains 20% water . How much dry fruit can be
840 votes. The total number of votes in the obtained from 100 kg orf fresh fruit ?
election is ?
32. Fresh fruit contains 90% water while dried
21. In an election 30% voted for the candidate A and grapes contain 20% water. How much dry
60% of the remaining voted for the candidate B. grapes can be obtained from 20 kg of fresh
The remaining voters did not vote. If the grapes ?
candidate won by 1200 votes. Find the total no.
of people who did not vote ? 33. When the price of a product was decreased by
10% , the number sold increased by 30%. What
22. In an election , two candidates participated , was the effect on total revenue?
20% voters did not vote . The winner gIets 70%
of the valid and and won by 9600 votes. The 34. Salary of a person was decreased by 20% and
total number of valid votes ? subsequently increased by 25%. Find the effect
votes on his overall salary?

23. Tanya spends 20% on hotel , 15% on books , 10% 35. Successive discount of 10% and 5% is equivalent
on Transport and 30% on food from the money , to______________. B.des 2020A.
she got form his father . If she Save Rs.
A. 16.5% B. 15% C. 15.5% D. 14.5%
225.How much did she got from his father?
36. If the length of a rectangle is increased by 10%
24. Tanya spends 40% on hostel , 20% on book ,
and breadth is decreased by 10%. The area of
50% of the rest on Transport from the money
the new rectangle is
she got from his father ? If she saves Rs. 460.
a. neither increased nor decreased
How much did she got from his father ?
b. Increased by 1%
25. Tanya spends 40% on hostel , 20% of rest on C. Decreased by 1%
books , 50% of the rest on food from the money d. Decreased by 2%
she got from his father. If she saves Rs. 120.
37. In an examination , 35% of total students failed
How much did she get from his father ?
in Hindi , 45% failed in English and
26. In a mixture of 40 L milk and water ., 10% is 20% in both. Find the percentage of those who
water . How much water should be added to the passed in both the subjects.
mixture , so that it becomes 20% of the
38. In an examination , 80% of the students passed
mixuture.
in english , 85% in mathematics and 75% in both
27. How much water should be added to a 9L acid - english and mathematics . If 40 students failed
water solution which contains 50% acid so that in both the subjects .find the total number of
it becomes 30% acidic ? students .

28. If a student scores 25% marks he is failed by 39. In a school , 40% of the students play football
210 marks but If he scores 55% marks , he gets and 50% play cricket. If 18% of the students play
240 marks more than the pass marks. Find the neither football nor cricket , the percentage of
total marks in the class ? students playing both is
a. 40% b. 32% c. 22% d. 8%
29. A six litre solution of water and salt contains
5% salt . If the solution is heated for an hour. It 40. The price of an item was cut by 20%, then new
becomes 5L. Find the % of salt in new solution ? price was reduced by another 15% and finally,
during fest season, it was decreased once
30. If two litres of water gets evaporated when 10 again by 10%. By how many percent was the
litres of 6% sugar solution is boiled, find the initial price cut in all?
percentage of sugar in the remaining solution ? a.38.8 b. 40
c. 45 d. 40.8

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