Answer / saji

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%

Answer / feedow

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%

Answer / mardana

3rd person is correct ans is 62.2

Answer / kartik

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

Answer / tinku

64%

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