ATQ, Since the new average increases by 0.4 years, the difference in the sum of ages of the students who left and the new students should be: 50×0.6 = 30 years Option I: (42+24+34) − (18+26+26) = 30 years So, option I can be the answer. Option II (57+24+34)−(18+26+40) = 31 years So, option II cannot be the answer. Option III: (36+24+34)−(18+26+21) = 29 years So, option III cannot be the answer.
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In a competitive examination containing 200 questions, 2 marks are awarded for every correct answer and 1 mark gets deducted for every wrong answer. If ...
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In a survey conducted in a locality, it was found that 50% read newspaper A, 40% read newspaper B, and 20% read neither A nor B. If the number of person...
