1. The average of five numbers is 57.8.The average of the first and the second numbers is 77.5 and the average of the fourth and fifth numbers is 46.What is the third number ?






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  • By: anil on 05 May 2019 01.25 am
    Let the numbers be a,b,c,d and e. Now $$frac{a+b+c+d+e}{5}$$=57.8*5 a+b+c+d+e=292 Now, $$frac{a+b}{2}$$=77.5, a+b=155 Also, $$frac{d+e}{2}$$=46, d+e=92. Now, c=292-(a+b)-(d+e)=292-92-155=42. Hence, the correct option is C.
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