Subject
Quantitative Aptitude
Topic
Percentage
A student multiplied a number by 3/5 instead of 5/3, What is the percentage error in the calculation ?
A student multiplied a number by 3/5 instead of 5/3, What is the percentage error in the calculation ?
ক)
54 %খ)
64 %গ)
84 %ঘ)
74 %Explanation
Let the number be x. Then, ideally he should have multiplied by x by 5 3. Hence Correct result was x (5 3)= 5x 3. By mistake he multiplied x by 3/5 . Hence the result with error = 3x 5 Then, error = (5x 3 - 3x 5) = 16x 15 Error % = (error True vaue) 100 = [(16 15) x (5 3) x] 100 = 64 %Related questions
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