Percentages Quiz Set 010

Advertisement


Your Score
Correct Answers:
Wrong Answers:
Unattempted:

Question 1

If 70% of X is Y, then Y% of 70 is?

 A

49 % of X.

 B

59 % of X.

 C

39 % of X.

 D

69 % of X.

Soln.
Ans: a

We have Y = $(70 × X)/100$, so Y% of 70 is same as $(70 × X)/100$% × 70, which can be rearranged to $(70 × 70)/100$% × X = 49% of X.


Question 2

A carton contains 6000 led bulbs, some of them are red, some green and others are blue. How many are green if 9% are red and 3% are blue?

 A

5280.

 B

5380.

 C

5180.

 D

5480.

Soln.
Ans: a

The percentage of green is 100 - (9 + 3) = 88. So number of green bulbs = $88/100$ × 6000 = 5280.


Question 3

Mr. X who spends 69% of his salary is able to save Rs. 186. What is his salary?

 A

Rs. 600.

 B

Rs. 700.

 C

Rs. 500.

 D

Rs. 800.

Soln.
Ans: a

Let the salary be x. His saving% is 100 - 69 = 31, so 31% of x = 186, which gives x = $186/31$ × 100 = Rs. 600.


Question 4

In a sample there are 1620 items having a value of 50°C. 10% values are below 50°C, and the number of values above 50°C is $2/3$ of the items having a value of 50°C. What is the size of the sample?

 A

3000 items.

 B

3010 items.

 C

2990 items.

 D

3020 items.

Soln.
Ans: a

The %age ≥ 50°C = (100 - 10) = 90. If x is the size of the sample, 90% of x = 1620 + $2/3 × 1620$ = ${5 × 1620}/3$, which is same as ${90 × x}/100$ = ${5 × 1620}/3$. Solving, we get x = 3000.


Question 5

A clerk multiplied a number by 5/2 instead of 2/5. What is the percentage of error?

 A

84 %.

 B

86 %.

 C

82 %.

 D

88 %.

Soln.
Ans: a

If the actual figure is x, the error is ${5x}/2$ - ${2x}/5$ = ${5^2x - 2^2x}/{5 × 2}$ = ${21x}/10$, so %-error = ${(21x)/10}/{(5x)/2}$ × 100 = ${21 × 2}/{10 × 5}$ × 100 = 84%.


buy aptitude video tutorials


Creative Commons License
This Blog Post/Article "Percentages Quiz Set 010" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Updated on 2019-08-18.

Posted by Parveen(Hoven),
Aptitude Trainer


Advertisement