Question

determine o valor de x de modo que as sentenças representem proporçoes

a } x\5=21\35 b } 15\4=90\x c} 9\13=x\26 d } 2\5=x\200

Answer 1

Temos o seguinte:

a) (x/5) = (21/35)
35x = 21*5
35x = 105
x = 105/35
x = 3
-----------
b) (15/4) = (90/x)
15x = 4*90
15x = 360
x = 360/15
x = 24
-----------
c) (9/13) = (x/26)
13x = 9*26
13x = 234
x = 234 / 13
x = 18
-----------
d) (2/5) = (x/200)
5x = 2*200
5x = 400
x = 400/5
x = 80