**Question:** If we have to weigh 31 kgs of rice using only 1 kg stone. What are the minimum number of weighing operations required?

**Answer:**

5 weighing operations:

Rice Counter weight

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1kg (1kg stone)

2kg (1kg rice + 1kg stone)

4kg (1+2+1)

8kg (1+2+4+1)

16kg (1+2+4+8+1)

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total: 31kg rice