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 14 of 14.
Priyanka bhumbar said:
9 months ago
Let a 45 no consider any number.
3/5 * 45 = 27
5/3 * 45 = 75.
Then the number is multiple into 100%.
27/75 * 100 = 36
100 - 36 = 64%.
3/5 * 45 = 27
5/3 * 45 = 75.
Then the number is multiple into 100%.
27/75 * 100 = 36
100 - 36 = 64%.
(46)
Vinay said:
1 month ago
Let's assume no is 30 it is divisible by both 5 and 3 ,and not get fractions.
No = 30.
3/5 * 30 =18
5/3 * 30 = 50
Error means = (difference/correct value ) * 100
Error = 32/50*100
Ans = 64.
No = 30.
3/5 * 30 =18
5/3 * 30 = 50
Error means = (difference/correct value ) * 100
Error = 32/50*100
Ans = 64.
(16)
Jatin Kumar said:
3 weeks ago
Let assume the number of 60.
now 3/5 * 60 = 36,
5/3 * 60 = 100.
Then the number is multiplied in to 100%.
36/100*100 = 36,
100-36 = 64.
now 3/5 * 60 = 36,
5/3 * 60 = 100.
Then the number is multiplied in to 100%.
36/100*100 = 36,
100-36 = 64.
(3)
Ashi said:
5 days ago
Take LCM of the denominator i.e 3 x 5 = 15.
3/5*15 = 9 (this is the number we mistakely multiplied)
(but the number should have been this all along ) 5/3 * 15 = 25.
Difference -> 25 - 9 = 16.
Now, 16/25(the right number)* 100 = 64%.
3/5*15 = 9 (this is the number we mistakely multiplied)
(but the number should have been this all along ) 5/3 * 15 = 25.
Difference -> 25 - 9 = 16.
Now, 16/25(the right number)* 100 = 64%.
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