Question

find value of A, B and C.​

Answer 1

Answer:

A=35kg

B=42kg

C=30kg

Step-by-step explanation:

A+B=77 - - (1)

B+C=72 - - (2)

A+C=65 - - (3)

(2)-(1)

A-C=5--(4)

A+C=65

2A=70

A=65kg

35+B=77

B=42

C=30

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Answer 2

Answer:

35 kg, B = 42 kg, C = 30 kg

Step-by-step explanation:

A + B = 77 ----------- [ 1 ]

B + C = 72 ----------- [ 2 ]

A + C = 65 ----------- [ 3 ]

Adding all the 3 equations together:

A + B + B+ C + A + C = 77 + 72 + 65

2A + 2B + 2C = 214

A + B + C = 107 ----------- [ 4 ]

[ 4 ] - [ 1 ] :

C = 107 - 77 = 30

[ 4 ] - [ 2 ] :

A = 107 - 72 = 35

[ 4 ] - [ 3 ]:

B = 107 - 65 = 42

Answer: A = 35 kg, B = 42 kg, C = 30 kg