Aptitude - Percentage - Discussion
Discussion Forum : Percentage - General Questions (Q.No. 9)
9.
| A student multiplied a number by | 3 | instead of | 5 | . |
| 5 | 3 |
What is the percentage error in the calculation?
Answer: Option
Explanation:
Let the number be x.
| Then, error = | 5 | x - | 3 | x = | 16 | x. |
| 3 | 5 | 15 |
| Error% = |  |
16x | x | 3 | x 100 |  % = 64%. |
| 15 | 5x |
Discussion:
134 comments Page 11 of 14.
Surya said:
5 years ago
Take example 150.
150*3/5 = 90.
150*5/3 = 250.
90/250*100 = 36.
100-36 = 64%.
150*3/5 = 90.
150*5/3 = 250.
90/250*100 = 36.
100-36 = 64%.
Srikanth said:
5 years ago
Thank you @Pradip.
Alpesh said:
5 years ago
15 * 3/5 = 9,
5/3 * 15 = 25,
25 - 9 = 16,
16/25 * 100 = 64%.
5/3 * 15 = 25,
25 - 9 = 16,
16/25 * 100 = 64%.
Anjali said:
5 years ago
How 5/3 - 3/5 be 16/5???? it is 16/15.
Now,the answer should be 16/15 * 3/5 *100 = 34%.
Now,the answer should be 16/15 * 3/5 *100 = 34%.
Siva said:
5 years ago
Let take the number be 30.
30*(5/3) = 50.
30*(3/5) = 18.
The difference between both which is the error value is 32.
To find error percentage;
(32/50) * 100 = 64%.
30*(5/3) = 50.
30*(3/5) = 18.
The difference between both which is the error value is 32.
To find error percentage;
(32/50) * 100 = 64%.
Umesh chandra said:
5 years ago
How it will be? could you please explain?
Gayathri S said:
5 years ago
5/3 - 3/5 =?
Let's multiply 3*5 =15 which is the LCM
Now multiply 15 with 5/3 and 3/5 :
(15* 5/3) - (15* 3/5) = (25 - 9) /15
*= 16/15.
Error % = (16/15 * 3/5 * 100)%
= 64%.
Let's multiply 3*5 =15 which is the LCM
Now multiply 15 with 5/3 and 3/5 :
(15* 5/3) - (15* 3/5) = (25 - 9) /15
*= 16/15.
Error % = (16/15 * 3/5 * 100)%
= 64%.
Prabesh Satyal said:
5 years ago
Good @Alpesh.
Before determining no 15 for a multiple of ratios one has to do LCM of the denominators.
Before determining no 15 for a multiple of ratios one has to do LCM of the denominators.
SATHISHKUMAR R said:
4 years ago
Formula:
%of error = Question/comparison value * 100.
Here the question is finding an error.
Comparison is the true value.
3/5 x-5/3 x = 16/15 (LCM)/x means unknown value.
16/15 /(5/3) *100 = 64%.
%of error = Question/comparison value * 100.
Here the question is finding an error.
Comparison is the true value.
3/5 x-5/3 x = 16/15 (LCM)/x means unknown value.
16/15 /(5/3) *100 = 64%.
Chandu said:
4 years ago
5/3 - 3/5 = (5(5)-3(3))/15 = 16/15.
(16/15)/(3/5) x 100 = 64%.
(16/15)/(3/5) x 100 = 64%.
(1)
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers