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.
Prawin said:
2 decades ago
error = true vlue- false value
error=(5/3)x-(3/5)x
error=(5/3)x-(3/5)x
Toini N Mutota said:
9 years ago
I still didn't get it, how did you get the answer.
Triveni said:
9 years ago
@Chris It.
You clear my doubt. Thank you so much.
You clear my doubt. Thank you so much.
Raj said:
9 years ago
What is the logic behind the term (16x/15 * 3/5x)?
Chris IT said:
1 decade ago
Take L.C.M for the two numbers and subtract them.
Ybm said:
9 years ago
The shortcut is (Diff ÷ original number)100.
Satish said:
6 years ago
Thanks for the explanation @Pradeep and @Jack.
Sudhan said:
9 years ago
@Srihari.
Your method is awesome, Thank you.
Your method is awesome, Thank you.
Harshit Garg said:
10 years ago
Why error% can't be = error/incorrect value?
Madhu said:
8 years ago
Why should we divide by true value at last?
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