Three independent mechanisms A, B and C have been incorporated for fuel saving in a car producing respectively 30%, 20% and 40% efficiency. Assuming that they operate independently, what is the net fuel efficiency achieved?
(a) 61 % (b) 64% (c) 62% (d) 66.4% (e) 69%

• SUPPOSE TOTAL fuel consumption was 100....firstly by A 30 was saved...out of remaining 70 by using B 14 was saved and out of remaind 56 by using C 22.5 can b saved...
  so finally total=30+14+22.5=66.4%
• 12 years agoHelpfull: Yes(27) No(0)