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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