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 4 of 14.
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%.
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%.
Srikanth said:
5 years ago
Thank you @Pradip.
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%.
Anirudh said:
5 years ago
Error = true value - false value.
Percentage of x = x*100 / true value.
Percentage of x = x*100 / true value.
Satyam said:
6 years ago
Thanks @Pradip.
Sanjay said:
6 years ago
How did 16 come?
Satish said:
6 years ago
Thanks for the explanation @Pradeep and @Jack.
Bishal Chakraborty said:
6 years ago
Just take LCM OF 3and 5, assume the number is 15.
So, if multiplied by 3/5 it will be 9 if by 5/3 it will be 25. So, the diff is 16.
Percentage 16/25 * 100% = 64%.
So, if multiplied by 3/5 it will be 9 if by 5/3 it will be 25. So, the diff is 16.
Percentage 16/25 * 100% = 64%.
Anshuman said:
6 years ago
The difference between the two nos become 16/15.
Then the percentage of 16/15 in the true value 5/3 is 64%.
16/15 * 100 = 64%. @Sandhavi.
Then the percentage of 16/15 in the true value 5/3 is 64%.
16/15 * 100 = 64%. @Sandhavi.
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