How many number of weights do u need to weigh 31 kg of rice if u have only one 1kg weights stone ?	Choose the correct option
A) 30	B) 31	C) 5	D) 4	E) 3
first measure 1kg rice by 1 kg weight   then use this 2kg (1kg rice+ 1 kg weight) to measure 2kg rice   now combine this to get 3kg rice + 1 kg weight to measure 4 kg rice   add this newly measure 4kg + 3kg + 1kg weight to measure 8 kg   add this 8kg+ 4kg + 3kg + 1kg weight to measure 16 kg rice   now combining all u get 31 kg rice + 1 kg weight   so the answer is 5   ANSWER:5
<result>C</result>
How many number of weights do u need to weigh 31 kg of rice if u have only one 1kg weights stone ?