Explicação passo-a-passo:
a)
[tex]x = 5 \times \frac{16}{20} [/tex]
[tex]x = \frac{80}{20} [/tex]
[tex]x = 4[/tex]
b)
[tex]x + 10 =40 \times \frac{9}{10} [/tex]
[tex]x + 10= \frac{360}{10} [/tex]
[tex]x = 36 - 10[/tex]
[tex]x = 26[/tex]
c)
[tex]x = 2 \times \frac{15}{3} [/tex]
[tex]x = 2 \times 5[/tex]
[tex]x = 10[/tex]
d)
[tex]x + 3 = 2 \times \frac{20}{8} [/tex]
[tex]x + 3 = \frac{40}{8} [/tex]
[tex]x = 5 - 3[/tex]
[tex]x = 2[/tex]
e)
[tex]12x = 48 \times 16[/tex]
[tex]12x = 768[/tex]
[tex]x = \frac{768}{12} [/tex]
[tex]x = 64[/tex]
