The perimeter of a triangle is the sum of the lengths of all three sides.
In this case, the perimeter is given as 160 cm.
We are also given that two of the sides are 40 cm and 50 cm.
Let's denote the length of the third side as x cm.
According to the given information, we can set up the equation: 40 + 50 + x = 160.
Combining like terms, we have: 90 + x = 160.
Subtracting 90 from both sides of the equation, we get: x = 160 - 90 = 70.
Therefore, the length of the third side is 70 cm.
#### 70
The answer is: 70
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
If the perimeter of a triangle is 160 cm and two of the sides are 40 cm and 50 cm, what is the length of the third side?

### Answer:
