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 3 of 14.
Sasi said:
1 decade ago
Its so simple.
true value =5/3x;
false value=3/5x;
=(3/5)(3/5)(5/3)x
=(9/25)(5/3)x
=(0.36)(5/3)x
error=1-0.36
=0.64
error%=64%
true value =5/3x;
false value=3/5x;
=(3/5)(3/5)(5/3)x
=(9/25)(5/3)x
=(0.36)(5/3)x
error=1-0.36
=0.64
error%=64%
Sona said:
1 decade ago
Error = true value- false value i.e 16/15
true value is 3/5
now question raise that 16/15 is what percent of 3/5
so
x% = 3/5*16/15
x% = 16/25 i.e 0.64
so x = 64%
true value is 3/5
now question raise that 16/15 is what percent of 3/5
so
x% = 3/5*16/15
x% = 16/25 i.e 0.64
so x = 64%
Gabbar said:
1 decade ago
Good rashmi ji...
Avnish said:
1 decade ago
If i multiply 15 to both 3/5 and 5/3 the ans is
9 and 25 but 9 is not 64 % of 25...
can some one tell me this thing...
9 and 25 but 9 is not 64 % of 25...
can some one tell me this thing...
Prasad said:
1 decade ago
Well you took 9 and 25 ok
the difference between 25 and 9 becomes error i.e.. 16
error percentage is error/true value * 100
now 16/25*100 = 64%
the difference between 25 and 9 becomes error i.e.. 16
error percentage is error/true value * 100
now 16/25*100 = 64%
Yugank Garg said:
1 decade ago
(3X/5) *100/ (5x/3) = 36%.
It means 3X/5 is 36% of original 100%.
Therefore percentage error is 64%.
It means 3X/5 is 36% of original 100%.
Therefore percentage error is 64%.
Gowtham said:
1 decade ago
30 is the common multiplying factor for the the both 5 and 3.
Then,
30*3/5=18,
30*5/3=50,
Make the answer for 100%
Then 18 became 36 and 50 to 100,
Subtract the final output to get an answer 64%.
Then,
30*3/5=18,
30*5/3=50,
Make the answer for 100%
Then 18 became 36 and 50 to 100,
Subtract the final output to get an answer 64%.
Vijayakumar said:
1 decade ago
Error% = (true value-false value)*100/true value.
% of error = ((5/3)-(3/5))*100/(5/3).
= (16/15)*100*(3/5).
= 64%.
% of error = ((5/3)-(3/5))*100/(5/3).
= (16/15)*100*(3/5).
= 64%.
Swetha said:
1 decade ago
Do anyone please tell me how 16/15 came in the simplification of (5/3) - (3/5).
(5/3) - (3/5) = 16/5 how?
(5/3) - (3/5) = 16/5 how?
Chris IT said:
1 decade ago
Take L.C.M for the two numbers and subtract them.
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