Solve the following problems and select the correct answer:

Luis earns a salary of [tex]$\$500$[/tex], spends [tex]$\frac{2}{5}$[/tex] of his salary on books and [tex]$\frac{1}{10}[tex]$[/tex] on clothes. How much does he spend and how much is left?

A. Spends $[/tex]\[tex]$150$[/tex] and has [tex]$\$[/tex]350[tex]$ left.
B. Spends $[/tex]\[tex]$250$[/tex] and has [tex]$\$[/tex]250[tex]$ left.
C. Spends $[/tex]\[tex]$140$[/tex] and has [tex]$\$[/tex]360[tex]$ left.

Complete the equations with the correct signs ($[/tex]+[tex]$, $[/tex]-[tex]$, $[/tex]\times[tex]$, $[/tex]\div$) to make the equality true:

[tex]a=\frac{5}{3} \quad \frac{3}{7}=\frac{44}{21} \quad b=\frac{6}{7} \quad \frac{y}{5}=\frac{80}{20}[/tex]

Perform the following operations and select the correct answer:

[tex]\frac{-4}{6} + \frac{7}{8}[/tex]

A. [tex]\frac{25}{-141}[/tex]
B. [tex]\frac{10}{48}[/tex]
C. [tex]\frac{47}{48}[/tex]
D. [tex]\frac{25}{141}[/tex]



Answer :

Vamos a detallar la solución paso a paso.

Luis tiene un sueldo de [tex]$500$[/tex] dólares. Según el problema, gasta [tex]\(\frac{2}{5}\)[/tex] de su sueldo en libros y [tex]\(\frac{1}{10}\)[/tex] en ropa.

1. Cálculo del gasto en libros:
[tex]\[ \text{Gasto en libros} = \frac{2}{5} \times 500 = 200 \, \text{dólares} \][/tex]

2. Cálculo del gasto en ropa:
[tex]\[ \text{Gasto en ropa} = \frac{1}{10} \times 500 = 50 \, \text{dólares} \][/tex]

3. Cálculo del gasto total:
[tex]\[ \text{Gasto total} = 200 + 50 = 250 \, \text{dólares} \][/tex]

4. Cálculo del dinero restante:
[tex]\[ \text{Dinero restante} = 500 - 250 = 250 \, \text{dólares} \][/tex]

Entonces, Luis gasta [tex]$200 en libros, $[/tex]50 en ropa, un total de [tex]$250, y le quedan $[/tex]250. La opción correcta es [tex]\( b \)[/tex].