Some quantity of petrol is found to be adulterated to the extent of 15%. What proportion of the adulterated petrol should be replaced with pure petrol to take the purity level to 95%?

• Assume entire quantity of petrol is 100.
  now 15% is adulterated
  remaining pure quantity is 85.
  and adulterated portion is 15
  To take the purity level to 95% we should add 10 more
  So 10*100/15=66.67 %
• 5 years agoHelpfull: Yes(5) No(0)
• x+85/100(100-x)=95
  x+0.85(100-x)=95
  x+85-0.85x=95
  0.15x=10
  x=66.6
• 7 years agoHelpfull: Yes(2) No(5)
• take n=1;
  solvn- 49-27=22
  22 is a ans
• 6 years agoHelpfull: Yes(2) No(0)
• Lets assume x ltr pure petrol is added and the volume becomes 100ltr.
  So, petrol solution
  x+85)/100(100-x)=95 (95 is the purity level in the final solution)
  =>x+85-0.85x=95
  =>x=66.67
  So, 66.67 ltr of pure petrol is added to the adulterated solution.
• 6 years agoHelpfull: Yes(2) No(0)
• we have to get 98% purity.
  let x ltr pure petrol is added and the volume becomes 100ltr.
  so;
  petrol solution
  x+85/100(100-x)=95 (95 is the purity level in the final solution)
  =>x+85-0.85x=95
  =>x=66.67
  so 66.67 ltr of pure petrol is added to the adulterated solution.
• 7 years agoHelpfull: Yes(1) No(3)
• Initial let x(adulterated) and y is taken and same quantity replaced by pure,then by allegation
  x-y y
  85 100
  95
  (100-95/95-85)=x-y /y
  Y/x= 2/3
  Hence 66.67%
• 5 years agoHelpfull: Yes(0) No(0)