Question

The average age of three friends A,B,C is 20 years.The average age of A and B is 19 years.What is the age of C?

Answer 1

Given

average of A, B , C ages is 20 years

average of A & B ages is 19 years

To Find

The age of C

Solution

Sum of The ages of A , B , C = 20 × 3

= 60

Sum of ages of A & B = 19 × 2

= 38

A + B + C = 60

38 + C = 60

C = 60 - 38

C = 22

so the age of C is 22 years

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Answer 2

Answer:

Given

average of A, B , C ages is 20 years

average of A & B ages is 19 years

To Find

The age of C

Solution

Sum of The ages of A , B , C = 20 × 3

= 60

Sum of ages of A & B = 19 × 2

= 38

A + B + C = 60

38 + C = 60

C = 60 - 38

C = 22

so the age of C is 22 years

Step-by-step explanation: