Alligation question from Canada
3400 g of a 10% sulfathiazole cream to prepare a cream containing 15% sulfathiazole? The answer key says 200 g and I've tried it every way I can think of and cannot get this answer of 200 g. - - - - - - Reply (by Keith) An Alligation can work like this: 1) Play some tic-tac-toe 100 - - - 5 parts - - - 15 - 10 - - - - 85 parts 2)Reduce your parts to: 1 part (100%) to 17 parts (10%) 3)Divide your initial volume (10%) by it's # of parts. 3400 ÷ 17 = 200 4)Multiply that amt by the other strengths # of parts. 200 X 1 = 200 But... I'm actually a bigger fan of using an : 3400(.10)+(X)(1.0)=(3400+X)(.15) 340 + X = 510 + .15X .85X = 170 X = 200 |