Question 99302
Let x=amount of pure Super Grow that needs to be added

Then 32-x=amount of 12% solution


Now we know that the amount of pure Super Grow in the 12% solution (0.12(32-x))plus the amount of pure Super Grow added (x) has to equal the amount of pure Super Grow in the final mixture (0.175(32)).  So our equation to solve is:

0.12(32-x)+x=0.175*32  get rid of parens 

3.84-0.12x+x=5.6  subtract 3.84 from both sides

3.84-3.84-0.12x+x=5.6-3.84  collect like terms

0.88x=1.76  divide both sides by 0.88

x=2oz----------------amount of pure Super Grow that needs to be added

CK

0.12*30+2=0.175*32

3.6+2=5.6
5.6=5.6


Hope this helps---ptaylor