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 9 of 14.
Shanmukh Adari said:
7 years ago
Thank you @Srihari.
Ashutosh choudhury said:
7 years ago
X =15 ,
Because this number is divisible by both 3&5
5/3*15=25,
3/5*15=9,
The man should have got answer as 25 but he got 9,
So ,the difference is 25-9 =16,
If 25% of 100 then,
(16/25)*100 =64.
Because this number is divisible by both 3&5
5/3*15=25,
3/5*15=9,
The man should have got answer as 25 but he got 9,
So ,the difference is 25-9 =16,
If 25% of 100 then,
(16/25)*100 =64.
Ankit said:
7 years ago
5x/3-------> 16x/15 (error).
100--------> ?(error),
= 100 * (16x/15)/(5x/3).
100--------> ?(error),
= 100 * (16x/15)/(5x/3).
Mahesha said:
7 years ago
How after 16x/15 * 3/5x * 100 it came 64%? Explain me. Please.
S.AMIN ULLAH said:
7 years ago
How 16x/15 has been solved?
Please, Anybody can explain me this?
Please, Anybody can explain me this?
Sandeep said:
7 years ago
We have multiplied a number by 3/5 instead of 5/3.
So, just find the difference between them,
5/3 - 3/5 = 16/15,
Now let's find out the error %,
For that, we have to take "the difference value" & "the multiplied value",
(16/15 * 3/5 * 100) = 64.
So, just find the difference between them,
5/3 - 3/5 = 16/15,
Now let's find out the error %,
For that, we have to take "the difference value" & "the multiplied value",
(16/15 * 3/5 * 100) = 64.
Ameer said:
6 years ago
Let's say the number is = 100.
3/5 * 100 = 60 and 5/3 * 100 = 166.66,
Error = 166.66-60 = 106.66.
Error% = error/true value.
=106.66/(5/3),
= 64( for percetage i.e 64%).
3/5 * 100 = 60 and 5/3 * 100 = 166.66,
Error = 166.66-60 = 106.66.
Error% = error/true value.
=106.66/(5/3),
= 64( for percetage i.e 64%).
Deepak Kumar MR said:
6 years ago
(3/5)/(5/3) = 9/25 so in fractions it is 0.36 minus this value with 1-0.36 = 0.64 which is 64%.
Geet said:
6 years ago
Will it be 60/166*100?
P DHAMODARASAMY said:
6 years ago
Problem is 3/5 instead of 5/3.
So, we treat is as a ratio which is 3/5: 5/3,
Take lcm for 5 and 3, is 15,
Hence 3 * 15/5 : 5*15/3.
9:25. so the difference is 16.
Finally, 16 %of 25 is 64%.
So, we treat is as a ratio which is 3/5: 5/3,
Take lcm for 5 and 3, is 15,
Hence 3 * 15/5 : 5*15/3.
9:25. so the difference is 16.
Finally, 16 %of 25 is 64%.
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