A mixture of 40 liters of milk and water contains 10% water. How much water should be added to this so that water may be 20% in the new mixture?
A. 6.5 liters B. 5 liters C. 4 liters D. 7.5 liters

• Mixture of 40 liters of milk=36M and 4W(Ratio is 90:10)
  Now the New mixture shall be in the ratio of 80:20
  Now water shall be added but milk shall not be touched
  therefore 80% is equivalent to 36
  100% is (36/80)*100=45
  Thus water shall be added=(45-36-4)=5 liters of water
• 12 years agoHelpfull: Yes(20) No(2)
• Let x be the water to be added
  So, as per problem,
  (4+x)=20/100 *(40+x)
  Hence x = 5 lit
• 10 years agoHelpfull: Yes(17) No(3)
• In a new mixture.. the milk should be 80%
  so 36 ltr= 80%
  so total will be 36*100/80= 45 ltr
  hence added water is 45-40 = 5 ltr
• 11 years agoHelpfull: Yes(6) No(0)
• 40 liters of mixture contains 4 liters of water (10%). So, it has 36 liters of milk.
  if 36 liters 80%,
  100% (36/80)x100 = 45 liters
  
  So, the total water in the mixture should be 9 liters. Since there is already 4 liters in the mixture, 5 liters need to be added.
• 11 years agoHelpfull: Yes(4) No(0)
• Ans-5 lit
  x-40=x/5
  x=50(total mixure)
  20% means 10 lit should be in the mixture
  10% means 5 lit is already present so rest 5 lit would be added.
• 10 years agoHelpfull: Yes(3) No(0)
• In a new mixture.. the milk should be 80%
  so 36 ltr= 80%
  so total will be 36*100/80= 45 ltr
• 11 years agoHelpfull: Yes(2) No(3)
• 40*10/10=4
  4 liter of water and 36 liter of milk
  now 20*40/100=8
  now in new mixture water is 8 liter and milk is 32 liter
  so ratio =1:4
  4+x/36=1/4
  x=5 liter
• 9 years agoHelpfull: Yes(1) No(0)
• 4+x litres of water=20% then 36 litres of milk = 80%
  4+x/36=20/80
  x=5
• 7 years agoHelpfull: Yes(1) No(0)
• milk= 90% i.e. 36 litre
  water=10% i.e. 4 litre
  now, water is increased to 20%, so milk must be 80%.
  milk should not be touched and water level is changing.
  so ratio is 4:1=80%/20%.
  let x be added water in the mixture.
  milk/water= 36/(4+x)=4/1
  gives x=5 litre means 5 litre is added to the mixture to get water as 20%.
• 6 years agoHelpfull: Yes(1) No(0)