Question

Calcule o valor de a. Quem poder ajudar agradeço

Answer 1

a)

$a + 4a + 20 = 90 \\ 5a = 70 \\ a = 14$

b)

$\frac{a}{2} + a + 12 = 90 \\ \frac{3a}{2} = 78 \\ 3a = 156 \\ a = \frac{156}{3} \\ a = 52$

c)

$\frac{a}{4} + 20 + a + 40 = 180 \\ \frac{5a}{4} = 120 \\ 5a = 480 \\ a = \frac{480}{5} \\ a = 96$

d)

$a + 40 + \frac{2a}{3} = 180 \\ \frac{5a}{3} = 140 \\ 5a = 420 \\ a = \frac{420}{5} \\ a = 84$

e)

$\frac{3a}{2} = 55 - a \\ 3a = 110 - 2a \\ 5a = 110 \\ a = \frac{110}{5} \\ a = 22$