Question

The cafeteria sells 40 drinks every 20 minutes. How many drinks does the cafeteria sell in 10 pointsan hour?A.)1200 drinksB.)140 drinksC.)120 drinks

Answer 1

To obtain the number of drinls that the cafeteria sells in an hour, the following steps are recommended:

Step 1: Express the rate at which the cafeteria sells drinks, as follows:

$\frac{40drin\text{ks}}{20\text{minutes}}$

Step 2: Multiply the rate above by the appropriate conversion factor which will help express it in a per-hour basis, as below:

$\frac{40drin\text{ks}}{20\text{minutes}}\times(\frac{60min\text{ute}}{1\text{hour}})$

Step 3: Simplify to obtain the final expression, as follows:

$\begin{gathered} \frac{40drin\text{ks}}{20\text{minutes}}\times(\frac{60min\text{ute}}{1\text{hour}}) \\ \Rightarrow\frac{2400\text{drinks}}{20\text{hour}} \\ \Rightarrow\frac{120drin\text{ks}}{1\text{hour}} \end{gathered}$

Therefore, the cafeteria sells 120 drinks in an hour