he rectangular playground in Mohammed's school is three times as long as it is wide. The perimeter of the playground is 200 meters. What is the length of the long side?

Let's denote the width of the playground as x.

Since the playground is three times as long as it is wide, the length of the playground is 3x.

The perimeter of a rectangle is calculated by the formula: 2*(length + width).

In this case, the perimeter is 200 meters. So, we can set up the equation:

2*(3x + x) = 200

Solving this equation will give us the values of x (width) and 3x (length).

Step 1: Simplify the equation:

2*(4x) = 200

Step 2: Divide both sides by 2:

4x = 100

Step 3: Divide both sides by 4:

x = 25

So, the width of the playground is 25 meters.

The length of the playground is 3 times the width, so the length is:

3x = 3*25 = 75 meters.

So, the length of the long side of the playground is 75 meters.