Question
If a + b = 8,
b + c = 10
and c + a = 12, what is the value of a + b + c = ?
A. 15
B. 30
C. 10
D. 12
Answer: A. 15
Solution:
We have :
a + b = 8
b + c = 10
c + a = 12
We have to find a + b + c
We add each column, So we found:
a + b + b + c + c + a = 8 + 10 + 12
2a + 2b + 2c = 30
2(a + b + c) = 30
a + b + c = 30/2
a + b + c = 15
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