If 15 chains cost Rs120, then how much do 70 chains cost ?

Answer

To find the cost of 70 chains when 15 chains cost Rs. 120, we can use the unitary method. Here’s a step-by-step solution:

### Step 1: Find the cost of one chain.
Given that the cost of 15 chains is Rs. 120, we can calculate the cost of one chain by dividing the total cost by the number of chains.

\[ \text{Cost of 1 chain} = \frac{\text{Total cost}}{\text{Number of chains}} = \frac{120}{15} = 8 \text{ Rs.} \]

### Step 2: Calculate the cost of 70 chains.
Now that we know the cost of one chain is Rs. 8, we can find the cost of 70 chains by multiplying the cost of one chain by the number of chains.

\[ \text{Cost of 70 chains} = \text{Cost of 1 chain} \times \text{Number of chains} = 8 \times 70 = 560 \text{ Rs.} \]

### Final Answer:
The cost of 70 chains is Rs. 560.

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