Plz explain with steps..

What s de answer for this question : Three independent
mechanisms A, B and C have been incorporated for power
saving in a plant producing respectively 30%, 40% and 10%
efficiency. Assuming that they operate independently, what
is the net power efficiency achieved.

(a) 62.2% (b) 68% (c) 61% (d) 64% (e) 56% ans 61..

Answers were Sorted based on User's Feedback

Plz explain with steps.. What s de answer for this question : Three independent mechanisms A, ..

chance that A is not efficient=.7
"...........B>>>............=.6
...........C.............=.9
if work together=.6*.7*.9=.378
so if they work together=1-.378=.622=62.2%

 Is This Answer Correct ? 25 Yes 1 No

Plz explain with steps.. What s de answer for this question : Three independent mechanisms A, ..

chance that a dont works is .7
b works is .6
c works is .9
so net efficiency is 1-(.7*.6*.9)
=62.2%

 Is This Answer Correct ? 13 Yes 1 No

Plz explain with steps.. What s de answer for this question : Three independent mechanisms A, ..

3rd person is correct ans is 62.2

 Is This Answer Correct ? 8 Yes 0 No

Plz explain with steps.. What s de answer for this question : Three independent mechanisms A, ..

its simple...just use the follow formula...
a+b+ab/100
here since it is saving therefore we use
-a-b+(-a)*(-b)/100
therefore for 1st 2 we get
-30-40+30*40/100=-58
then this intermediate ans wid 3rd gives..
-58-10+58*10/100=62.2

 Is This Answer Correct ? 6 Yes 0 No

Plz explain with steps.. What s de answer for this question : Three independent mechanisms A, ..

64%

 Is This Answer Correct ? 3 Yes 13 No

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