Question

Question No. 7
If a-b+c=1, a+b-c=2 and b+c-a= 3 then the value of 2a+4b+c equals ____________.
40
24
12
15
pls answer this question and irrelevant or unnecessary answers will be reported!!

Answer 1

Answer:

15

Step to step explanation:

• a - b + c = 1
• a + b - c = 2

ADDING BOTH

a - b + c + a + b - c = 1 + 2

2a = 3

a = 3/2

• a + b - c = 2
• b + c - a = 3

ADDING BOTH

a + b - c + b + c - a = 2 + 3

2b = 5

b = 5/2

• a - b + c = 1
• b + c - a = 3

ADDING BOTH

a - b + c + b + c - a = 1 + 3

2c = 4

c = 4/2 = 2

Now,

2a + 4b + c

2(3/2) + 4(5/2) + 2

3 + 10 + 2 = 15..

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