Question

year
u The Average age of A & B is 20 year. If c
were to replace A, the average would be 19 and if
C were to replace B, the average would be 21. The
ages of A, B and c are (in yeay)?​

Answer 1

Answer:

a = 22

b = 18

c = 20

Step-by-step explanation:

$\frac{a + b}{2} = 20 \\ a + b = 40 \\ \\ \frac{b + c}{2} = 19 \\ b + c = 38 \\ \\ \frac{a + c}{2} = 21 \\ a + c = 42 \\ \\ a +b + b+c + a+ c = 40 + 38 + 42 \\ 2(a +b +c) = 120 \\ a +b +c = 60$

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