Question 69

Average of a, b and c is 9. Average of b and c is 10. What is the value of a?

Solution

Average of a, b, c = 9

Average of b, c = 10

$$ \frac{a+b+c}{3} = 9 $$

a + b + c = 27 Eq.(i)

$$ \frac{b+c}{2} = 10 $$

b + c = 20 Eq.(ii)

Put Eq.(ii) in Eq.(i).

a + 20 = 27

a = 7

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