Question

3/4 teaspoon water in each gallon. how much in 5 gallons

Answer 1

We can solve this problem by applying the rule of three:

$\begin{gathered} \frac{3}{4}\text{ ------------ 1 gallon} \\ x\text{ ------------ 5 gallons} \end{gathered}$

then, x is given by

$x=\frac{(\frac{3}{4})(5)}{1}$

which gives

$\begin{gathered} x=(\frac{3}{4})(5) \\ x=\frac{15}{4} \end{gathered}$

that is, Pedro will mix 15/4 teaspoons on 5 gallons.

If we convert this result into a mixed fraction form, we obtain

$\frac{15}{4}=3\frac{3}{4}$