Mohan wants to buy a trapezium shaped field. Its side along the river is parallel to and twice the side along the road. If the area of this field is 10500 `m^2` and the perpendicular distance between the two parallel sides is 100 m, find the length of the side along the river.

Explanation

To solve the problem step by step, we will follow these instructions:

### Step 1: Identify the variables
Let the length of the side along the road be \( x \). According to the problem, the length of the side along the river is twice that of the side along the road, so we can express it as:
- Length along the river = \( 2x \)

### Step 2: Write down the area formula for a trapezium
The area \( A \) of a trapezium can be calculated using the formula:
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