The average of 8 numbers is 20. The average of first two numbers is $$15\frac{1}

Question

The average of 8 numbers is 20. The average of first two numbers is $$15\frac{1}{2}$$ and that of the next three is $$21\frac{1}{3}$$ . If the sixth number be less than the seventh and eighth numbers by 4 and 7 respectively, them the eighth number is :

Options:

A . 18

B . 22

C . 25

D . 27

Answer: Option C

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