### 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**

### Read More:

**If (a^2 +b^2 )=10 and ab=3; find a+b= ?**