The cost of 6 tables and 12 chairs is Rs. 7800. If the average cost of 1 table. is Rs. 750. Find the average cost of 1 chair.

Answer

To find the average cost of one chair, we can follow these steps:

### Step 1: Calculate the total cost of 6 tables.
Given that the average cost of one table is Rs. 750, we can calculate the total cost of 6 tables as follows:

\[ \text{Total cost of 6 tables} = \text{Average cost of 1 table} \times \text{Number of tables} \]
\[ = 750 \times 6 = 4500 \text{ Rs.} \]

### Step 2: Calculate the total cost of chairs.
We know that the total cost of 6 tables and 12 chairs is Rs. 7800. Now, we can find the total cost of the chairs by subtracting the total cost of the tables from the total cost:

\[ \text{Total cost of chairs} = \text{Total cost of tables and chairs} - \text{Total cost of tables} \]
\[ = 7800 - 4500 = 3300 \text{ Rs.} \]

### Step 3: Calculate the average cost of one chair.
Now that we have the total cost of 12 chairs, we can find the average cost of one chair:

\[ \text{Average cost of 1 chair} = \frac{\text{Total cost of chairs}}{\text{Number of chairs}} \]
\[ = \frac{3300}{12} = 275 \text{ Rs.} \]

### Final Answer:
The average cost of one chair is Rs. 275.

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