Question

On March 8, 2017, one U.S.Dollar was worth 19.61 Mexican pesos. On that date, how many dollars was 109.13 pesos worth? ROUND TO THE NEAREST HUNDREDTH DOLLAR

Answer 1

Let x be the amount of dollars that 109.13 pesos was worth. Since the ratio of dollars to pesos is 1 to 19.61, then:

`\frac{x\text{ dollars}}{109.13\text{ pesos}}=\frac{1\text{ dollar}}{19.61\text{ pesos}}`

Solve for x:

`\begin{gathered} \Rightarrow x\text{ dollars}=\frac{1\text{ dollar}}{19.61\text{ pesos}}*109.13\text{ pesos} \\ =(109.13)/(19.61)\text{ dollars} \\ =5.565017848...\text{ dollars} \\ \approx5.57\text{ dollars} \end{gathered}`

Therefore, the answer is: 5.57 dollars.