Question

plzzz explain....................

Answer 1

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 %

Answer 2

Answer:

( D ) 64 %

Step-by-step explanation:

Let the number Which was multiplied be x.

Hence, original answer = ( 5 / 3 ) x.

However, answer obtained = ( 3 / 5 ) x.

Difference = ( 5 / 3 ) x - ( 3 / 5 ) x = ( 16 / 15 ) x.

Thus, percentage error:

( Net difference / Original answer ) × 100

= [ { ( 16 / 15 ) x } / { ( 5 / 3 ) x } ] × 100

= ( 48 / 75 ) × 100

= 64 %