Question

To disinfect 1 quart of stream water to make it drinkable,you need to add 2 tablets of iodine. How many tablets do you need to disinfect 4 quarts

Answer 1

Good morning, 

We want to disinfect 4 quarts of stream water: $\frac{4}{4} =1$

So:

$\frac{ \frac{1}{4}of water }{2tablets}= \frac{1of water}{x tablets} \\ \\ \frac{1}{8} = \frac{1}{x} \\ \\ x=8 tablets$

Answer: We need 8 tablets.