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 10 of 14.
Mohan said:
8 years ago
Thanks @Sudharshan.
Madhu said:
8 years ago
Why should we divide by true value at last?
Aditya said:
8 years ago
Easier method. Think of a number divisible by both 5 and 3. Let's say x=15.
True Value = (5/3)*15 = 25.
Wrong Value = (3/5)*15 = 16.
Now calculate the error : 9/25 * 100.
64% is correct.
True Value = (5/3)*15 = 25.
Wrong Value = (3/5)*15 = 16.
Now calculate the error : 9/25 * 100.
64% is correct.
Mahima said:
8 years ago
Thank you all for the solution.
Rajendra Samir said:
8 years ago
Thanks All.
Pinky said:
8 years ago
How we get 64%?
Mohd Zeeshan said:
8 years ago
Thanks @Hari.
Raghava said:
7 years ago
I can't this. So, please explain me in a simple way.
Ajit Singh rathore said:
7 years ago
There is two number is given x and y,
So first find the difference between this two no. Y-x=z,
And than for find % error,
We have to find what % of y in z,
Then;
Y/z*100.
So first find the difference between this two no. Y-x=z,
And than for find % error,
We have to find what % of y in z,
Then;
Y/z*100.
Vaishu said:
7 years ago
Thank you @Srihari.
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