Question

The average weight of a and b is 36 and average weight of a,b,c is 31 then what is the weight of c?

Answer 1

Answer:

10

Step-by-step explanation:

ab/2=36

ab=36*2=72

abc/2=31

abc=31*2=62

72-62=10

Answer 2

The weight of c is 21 cm

Step-by-step explanation:

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

The average weight of a and b is 36

$36 = \frac{a+b}{2}\\36 \times 2 = a+b\\72 = a+b$

The average weight of a,b,c is 31

$31= \frac{a+b+c}{3}\\31 \times 3 = a+b+c\\93=a+b+c$

Substitute the value of a+b

So, $93=72+c\\93-72=c\\21=c$

Hence The weight of c is 21 cm

#Learn more:

Find the average of 40,50,60,70,80

https://brainly.in/question/7806051