Question

The chemical diacetyl is a natural flavoring that gives the taste of butter. A human candistinguish the butter flavor with 5 ppb (parts per billion). One gallon is approximately75,000 drops of water. How many gallons of water are equivalent to one billion drops?

Answer 1

hello

to solve this question, let's try to do this by viewing the question in relation to rates

1 gallon = 75,000 drops of water

x gallons = 1,000,000,000

$\begin{gathered} 1\text{gallon = 75,000 drops} \\ x\text{ gallons = 1,000,000,000 drops} \\ \text{cross multiply and make x the subject of formula} \\ x=\frac{1\times1,000,000,000}{75,000} \\ x=13,333.333\text{ gallons} \end{gathered}$

1 billion drops is equivalent to 13,333.33 gallons of water