The cost of 3 kg of rice is ₹180. The cost of 8 kg of rice is equal to that of 5 kg of pulse. The cost of 15 kg of pulses is equal to that of 2 kg of tea. The cost of 3 kg of tea is equal to that of 6 kg of walnuts. What is the cost (in ₹) of 10 kg of walnuts?

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**Solution:**

1. Calculate the cost of 1 kg of rice:
   - Cost of 3 kg rice = ₹180
   - Cost of 1 kg rice = $ \frac{180}{3} = 60 $

2. Use the relation between rice and pulse:
   - Cost of 8 kg rice = Cost of 5 kg pulse
   - Cost of 8 kg rice = $ 8 \times 60 = 480 $
   - Therefore, cost of 5 kg pulse = ₹480
   - Cost of 1 kg pulse = $ \frac{480}{5} = 96 $

3. Use the relation between pulses and tea:
   - Cost of 15 kg pulses = Cost of 2 kg tea
   - Cost of 15 kg pulses = $ 15 \times 96 = 1440 $
   - Therefore, cost of 2 kg tea = ₹1440
   - Cost of 1 kg tea = $ \frac{1440}{2} = 720 $

4. Use the relation between tea and walnuts:
   - Cost of 3 kg tea = Cost of 6 kg walnuts
   - Cost of 3 kg tea = $ 3 \times 720 = 2160 $
   - Therefore, cost of 6 kg walnuts = ₹2160
   - Cost of 1 kg walnut = $ \frac{2160}{6} = 360 $

5. Calculate the cost of 10 kg walnuts:
   - Cost of 10 kg walnuts = $ 10 \times 360 = 3600 $

**Answer:** ₹3600

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