In what proportions should a solution of 95%, 80%, 60% and 50% acid be mixed to produce a solution of 70% acid?
a. 4 : 1 : 1 : 5
b. 4 : 2 : 1 : 5
c. 4 : 3 : 1 : 5
d. 4 : 1 : 2 : 5

• To solve therse type of question the best way is to proced through matching answer
  
  Here in all options ratio of 95% and 50% is 4:5 fixed
  
  Therfore, 95*4 + 50*5 =630/9= 70%
  Remainning acid 80% and 60%.
  
  By option it is clear that if take 1:1 of these acid we get
  (80+60 )/2 =70
  So Answer is A
• 9 years agoHelpfull: Yes(19) No(1)
• (95*4+80*1+60*1+50*5)/4+5+1+1=70
• 9 years agoHelpfull: Yes(5) No(0)
• 95 50 80 60
  
  70 70
  
  20 25 10 10
  
  4 : 5 1 : 1
  final proportion 4:1:1:5
  option A
• 9 years agoHelpfull: Yes(3) No(4)
• a. 4:1:1:5
  because 95%*4=380
  here 100 is increasing that is overcome by 50%*5=250
  but we require 350 in this case for making 70%
  so 95% wil compermise that thing
  now we have to think about 80% and 70%. by both we required avg of 70 % so the ratio of 80% and 60% should be 1:1
• 9 years agoHelpfull: Yes(0) No(0)