**Problem:**
A room is 12 by 10 meters in size. The task is to find the cost of covering its floor with bricks that are 20 cm by 6 cm in size. The cost of 1000 bricks is ₹220.

**Solution:**

To find the cost of covering the floor with bricks, we need to determine the number of bricks required and then calculate the cost based on the given price per 1000 bricks.

1. **Calculating the number of bricks required:**
- Convert the dimensions of the room and the bricks into the same unit (meters).
- Convert 20 cm to meters: 20 cm = 0.2 m.
- Convert 6 cm to meters: 6 cm = 0.06 m.
- Calculate the area of one brick: Area = length * width = 0.2 m * 0.06 m = 0.012 m².
- Calculate the area of the room: Area = length * width = 12 m * 10 m = 120 m².
- Calculate the number of bricks required: Number of bricks = room area / brick area = 120 m² / 0.012 m² = 10000.

2. **Calculating the cost of covering the floor:**
- Given that the cost of 1000 bricks is ₹220, we need to find the cost of 10000 bricks.
- Calculate the cost per brick: Cost per brick = ₹220 / 1000 = ₹0.22.
- Calculate the total cost of 10000 bricks: Total cost = Cost per brick * Number of bricks = ₹0.22 * 10000 = ₹2200.

Therefore, the cost of covering the floor of the room with bricks that are 20 cm by 6 cm in size is ₹2200.

It is important to note that the dimensions of the room and the bricks were converted to the same unit (meters) to ensure accurate calculations. Additionally, the cost was calculated by finding the cost per brick and then multiplying it by the total number of bricks required.

I don't know