the bridge span is 360 meters long. the bridge is 30 meters shorter than the main span. write and solve an equation to the the length of the main span

To find the length of the main span, we can set up an equation based on the given information.

Let's assume the length of the main span is x meters.

According to the given information, the bridge is 30 meters shorter than the main span. So, the length of the bridge span is x - 30 meters.

The problem states that the bridge span is 360 meters long. Therefore, we can write the equation:

x - 30 = 360

To solve this equation for x, we can add 30 to both sides of the equation:

x - 30 + 30 = 360 + 30

Simplifying the equation, we have:

x = 390

Hence, the length of the main span is 390 meters.