1. A piece of work was finished by A, B and C together. A and B together finished 60% of the work and B and C together finished 70% of the work. Who among the three is most efficient?
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By: anil on 05 May 2019 01.48 am
Let total work to be done = 100 units Let efficiency of A, B and C be $$a,b,c$$ units/hr respectively. => $$a+b+c=100$$ -----------(i) A and B finish 60% of the work. => $$a+b=frac{60}{100} imes100=60$$ -------------(ii) Similarly, $$b+c=70$$ -----------(iii) Substituting value from equation equation (ii) in (i), => $$c=100-60=40$$ Similarly, $$a=30$$ and $$b=30$$ Thus, C is the most efficient. => Ans - (C)
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