Question

The average of a b c is 26 years .if the average age of a and c is29 years what is the age of b in years

Answer 1

given average age of a.b.c is 26 years
a+b+c/3=26
a+b+c=26×3=78
average age of a,c is 29 years a+c/2=29
a+c=29×2=58
b=78-58=20years
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Answer 2

The age of b is 20 years

Step-by-step explanation:

$Average = \frac{\text{Sum of observations}}{\text{No. of observations}}$

The average of a b c is 26 years

So,$26=\frac{a+b+c}{3}$

$26 \times 3 = a+b+c$

78=a+b+c

The average age of a and c is 29 years

$29 = \frac{a+c}{2}$

58=a+c

So, 78=a+b+c=58+b

78-58=b

20=b

Hence The age of b is 20 years

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