Question

If 2a+3b+4c=35 and 3a+5b+7c=30 , then a+b+c=?

Answer 1

$3a + 5b + 7c = 30 \\ 2a + 3b + 4c +( a + 2b + 3c) = 30 \\ 35 + (a + 2b + 3c )= 30 \\ a + 2b + 3c = - 5......(1) \\ \\ and \: w e\: know \\ \\ 2a + 3b + 4c = 35....(2) \\ subtract \\ (2) - (1) \\ a + b + c = 40$


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Answer 2

Step-by-step explanation:

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