Question

How many grams of water must be added to 2 grams of a 65% iodine solution in order to produce a 42% iodine solution?

Answer 1

x+2=y
0x+(2)(.65)=(.42)(y)
1.3=(.42)(y)
y=3.095
y=total solution
3.095-2=1.095

1.095 grams of water (I think)