What is the min. no. of weighing operations required to measure 31 kg of rice if only one stone of 1 kg is available?

a) 31 b) 6 c) 5 d) 16

• min no of weighting is 5
  16 8 4 2 1
  1 1 1 1 1 = add all 16+8+4+2+1 = 31
  so minimum is 5
• 11 years agoHelpfull: Yes(21) No(2)
• 5 is the corct ans.
  1 kg can b measur by 1 kg stone
  now v hv total 2kg weight(1 kg rice n 1 kg stone)
  Now again 2 kg rice can b measur by 2kg weight
  now v hv total 4 kg weight.
  4kg rice can b weight by 4 kg n so on
• 10 years agoHelpfull: Yes(5) No(3)
• min no of weighting is 6
  one stone is kept to weigh one kg of rice..one kg of rice plus one kg of stone can be used to weigh 2 kg of rice,. then 2kg of rice plus one kg of stone can be usd to weigh 3 kg of rice so on..
  
• 11 years agoHelpfull: Yes(4) No(7)
• -1 stone measure 1kg (total 2kg)
  -2 kg measure 2kg(total 4kg)
  - 4kg measure 4kg (total 8kg )
  -8kg measure 8kg(total 16kg)
  -16kg measure 16kg (total 32kg)
  
  32kg - 1stone= 31kg
  
  We need 5 operation :)
• 10 years agoHelpfull: Yes(3) No(2)
• 5 operations
  first time 1 kg rice
  2nd time 2 kg rice
  3rd time 4 kg rice
  4th time 8 kg rice
  5th time 16 kg rice
  Total 31 kg rice
• 8 years agoHelpfull: Yes(0) No(0)
• 5 ans.....
  step1: weight 1kg by using 1kg stone ===1
  step2:now keep 1kg stone+1kg rice on one side and weight 2kg rice ===2
  step3: now keep 1kg stone+1kg rice +2kg rice on one side and weight 4kg rice===4
  step4: now 1kg stone+rice(1kg+2kg+4kg)====8kg
  step5: 1kg stone +rice(1kg+2kg+4kg+8kr)====16kg
  
  now total ==1+2+4+8+16=31
• 4 years agoHelpfull: Yes(0) No(0)