If a:b:c = 3:4:7 then ratio (a+b+c):c is equal to:

Explanation: This is a direct mathematical ratio simplification problem. We can solve it using basic algebraic assignment.

### Important Facts & Steps:

• Given ratio: $a:b:c = 3:4:7$.
  


• Let us assign variable values based on proportions: $a = 3x$, $b = 4x$, $c = 7x$.
  


• Substitute into the expression $(a+b+c) : c$:
  

$$text{Sum} = 3x + 4x + 7x = 14x$$

• Therefore, the required ratio is:
  

$$14x : 7x$$

• Divide both parts by $7x$ to simplify:
  

$$2 : 1$$