Kumar Chandan
Kumar Chandan
9 years ago

A student multiplied a number by 3/5 instead of 5/3. What is the percentage error.

A. 64%

B. 65%

C. 66%

D. 67%

Solution(By Examveda Team)

Let number is 100.

Actual Multiplication = (100 *5)/3 = 500/3.

Student multiplied = (100 *3)/5 = 300/5.

Error,

= (500/3) - (300/5)

= (2500 - 900)/15

= 1600/15

%Error = (1600 *100 *3)/(15*500) = 64%.

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Comments ( 3 )

  1. Rafat Sultana
    Rafat Sultana :
    2 years ago

    In the last step why you have taken,
    1600×100×3/15×500 ???

  2. Giriteja Reddy
    Giriteja Reddy :
    8 years ago

    Let the number be x.

    Then, error = 5 x - 3 x = 16 x.
    3 5 15
    Error% = 16x x 3 x 100 % = 64%

  3. Sudhakar Prajapati
    Sudhakar Prajapati :
    8 years ago

    Correct Answer = Option A ( 64% )

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