Question

Omar jarred 6 liters of jam after 3 days. How many days does Omar need to spend making jam if he wants to jar 10 liters of jam in all? Assume the relationship is directly proportional.

Answer 1

To solve the exercise you can use a rule of three, like this

$\begin{gathered} 6\text{ liters}\rightarrow3\text{ days} \\ 10\text{ liters}\rightarrow x\text{ days} \end{gathered}$$\begin{gathered} x=\frac{10\text{ liters }\cdot3\text{ days}}{6\text{ liters}} \\ x=\frac{10\cdot3\text{ days}}{6} \\ x=\frac{10\cdot3}{6}\text{days} \\ x=\frac{30}{6}\text{days} \\ x=5\text{ days} \end{gathered}$

Therefore,