Question 647423
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
active ingredient = active ingredient, let x reprsent the amount of the 10% solution
  {{{.10x + .01(15ml-x) = .07*15ml }}}
         .09x = .06*15ml
            {{{x= .06*15ml/.09 = 10ml}}}  of 10% and 5ml of 1%
and..
 {{{.10*10ml + .01*5ml =  1.05 =  .07*15ml}}}