Question

Podem me ajudar a resolver essas perguntas?
a) x/5 + 100 +x/2 - 11 = 180

b)2x/3 + x/5 + 12 = 90

c) 3x/5 + 115 + 2x - 30 + 3x/5 + 115 = 360

Answer 1

a) x/5 + 100 +x/2 - 11 = 180

x/5 +x/2= 180 - 100 + 11

7x/10 = 91

x = (91 • 10)/ 7 → x = 930/7

x = 130


b) 2x/3 + x/5 + 12 = 90

2x/3 + x/5 = 90 - 12

(10x + 3x)/15 = 78

x = (78 • 15) / 13 → 1170/13

x = 90


c) 3x/5 + 115 + 2x - 30 + 3x/5 + 115 = 360

3x/5 + 2x+ 3x/5 = 360 -115 + 30 - 115

(3x + 10x + 3x)/ 5 = 160

16x = 60 • 5 → x = 800/16

x = 50