Question

A self-tanning lotion advertises that a 4-oz bottle will provide three applications. Jen found a great deal on a 13-oz bottle of the self-tanning lotion she had been using Based on the advertising claims, how many applications of the self-tanner should Jen expect? Jen can expect applications. (Round down to the nearest whole number.)

Answer 1

Answer:

9 applications.

Explanation:

A 4-oz bottle will provide three applications.

Let the number of expected applications from a 13-oz bottle = x

Expressing it as a ratio:

$\frac{4-oz}{3\text{ Applications}}=\frac{13-oz}{x\text{ Applications}}$

Next, cross multiply:

$\begin{gathered} 4x=3\times13 \\ \frac{4x}{4}=\frac{39}{4} \\ x=9.75 \\ x\approx9\text{ (rounded down to the nearest whole number)} \end{gathered}$

Jen can expect 9 applications.