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Average of A and B = 18 years So, (A+B)÷2 = 18 Now after three years and adding C, (A+B+C)÷3 +3 = 22, Equation-{1} So, (A+B+C+9)÷3 = 22 A+B+C+9 = 66 A+B+C = 57 A+B = 57-C So, Putting value of A+B in Equation 1, (57-C)÷2 = 18 57-C = 36 So, C = 57-36 = 21 So, C will be 21 years old.