A tin of oil was 4 / 5 full. When 6 bottles of oil were taken out and four bottles of oil were poured into it, it was 3 / 4 full. How many bottles of oil can the tin contain ?

a. 10
b. 20
c. 30
d. 40

• trial and error method: d)40
  40*4/5=32
  40*3/4=30
  now take out 6 bottles from 32, remaining is 26 and now add 4 to it which is equal to 30 so ans is 40.
• 10 years agoHelpfull: Yes(1) No(0)
• 4/5(x)-6+4=3/4(x)
  find x ?
• 10 years agoHelpfull: Yes(0) No(1)
• (4/5 -3/4)=1/20 for 2 bottles
  ans:40
• 9 years agoHelpfull: Yes(0) No(0)
• (4/5 -3/4)=1/20 for 2 bottles
  ans:40
• 9 years agoHelpfull: Yes(0) No(0)
• Effective amount taken out=-6+4=2 bottles.
  Now 2 bottles correspond to 5% of the capacity.For 100% capacity, we will have 2/5*100 which comes out tp be 40.
• 8 years agoHelpfull: Yes(0) No(0)
• easy method
  suppose tin contains 100 litres of oil(100*4/5=80litre contains now)
  simple equation:
  80-6x+4x = 100*3/4(calculate the value of x)
  
  now 100/x = ?ans
• 7 years agoHelpfull: Yes(0) No(0)
• tin contain 4/5 oil.
  6 bottles of were taken and we pour 4 bottles in than
  we get 3/4 of tin full
  first we find how much 3/4th of 4/5th
  4/5-x=3/4 we get 1/20
  it mean if two bottles makes tin full 1/20th portion full (1/20=2) then to full tin 100% we needed 40 bottles
• 6 years agoHelpfull: Yes(0) No(0)