Question

Miss Smith wants to by water bottles for her students for field day.She found a great deal where she can get 4 water bottles for $2.She has 24 students in her class .How much will it cost to buy water bottles for her class?

Answer 1

Let's set this up as a proportion ($x$ will be our answer).

$\dfrac{4 \,\,\textrm{students}}{\ 2} = \dfrac{24 \,\, \textrm{students}}{x}$

Using the fact that $\frac{a}{b} = \frac{c}{d}$ is the same as $d = \frac{c}{\frac{a}{b}}$, we can say:

$x = \dfrac{24 \,\,\textrm{students}}{\frac{4 \,\,\textrm{students}}{\ 2}} = 24\,\,\textrm{students} \cdot \dfrac{\ 2}{4\,\,\textrm{students}}$

Now, we can say:

$24 \,\,\textrm{students} \cdot \dfrac{\ 2}{4\,\,\textrm{students}} = \ 2 \cdot \dfrac{24 \,\,\textrm{students}}{4 \,\,\textrm{students}} = \ 2 \cdot 6 = \boxed{\ 12}$

Our answer is $12.

Answer 2

Hey there! :)

We know that 4 bottles cost $2, but we need to know the cost of each individual bottle. We can find out the cost by dividing 2 by 4

.2 ÷ 4 = .5

Therefore, each water bottle costs $0.50! Now that we know the price of a single water bottle, we can simply multiply the amount of students she has with the price of a single water bottle.

24 × $0.50 = $12

Therefore, it costs Miss Smith $12 to buy water bottles for her class.

~Hope I helped! :)