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If a+4b+7c=8 and 7a+5b+3c=10 , then find the value of a+b+c .

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+1 vote
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asked Oct 24, 2016 in Mathematics by Rahul Roy (7,895 points) ● 33 ● 108 ● 286

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answered Oct 25, 2016 by sarthaks (25,122 points) ● 9 ● 24 ● 36
selected Nov 5, 2016 by sarthaks
 
Best answer

Given a+4b+7c=8  -------- (1)   and

7a+5b+3c=10 -----------(2)

multiplying equation 1 by 7 and solving equation 1 and 2 we get:

b + 2c = 2 ---------(3)

Now from equation 1 and 3 we get:

a + b + c = 2

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