Question

Average weight of A, B, C is 40
if
together A, B thelu avevage weight is 35
and avevage weight of BC 36
find weight of B.​

Answer 1

Step-by-step explanation:

The average weight of A,B, C is 45 Kg. The average weight of A & B be 40 Kg & that of B,C be 43 Kg. Find the weight of B?

Average wt of A,B and C = 45 kg.

(A+B+C)/3= 45 kg

A+B+C = 45 *3

Thus A+B+C=135 kg ( eq 1)

Average weight of And B= 40 Kg

(A+B)/2= 40

Thus, A+B= 40*2 = 80 kg ( eq 2)

Average weight of B and C= 43

(B+C)/2= 43 kg

Thus , B+C= 43 *2 = 86 kg ( eq 3)

Let us add eq 2 and 3 to get : A+B+B+C = 80 + 86 kg = 166 kg

Thus, A+B+B+C= 166 kg.

or A+B+C+B= 166 kg.

But from eq 1 we know that , A+B+C= 135 kg.

Thus, 135+B= 166 kg.

Thus, B = 166–135= 31 kg.