Question

Calcule o valor de x nas proporções abaixo
a) x 6
---- = -----
10 5

b) 3 x
-----= ----
15 5

c) 2 7
----- = ------
x 14


d) 4 6
----- = -----
20 x

Answer 1

a)
x==============6
10============  5

5x = 6x 10

5x = 60

x= 60/5

x= 12

b)3=============x
    15============5

15x = 3 x 5 
15x = 15

x= 15/15

x= 1

c) 2==============7
     x==============14

7x = 14 x 2 
7x = 28

x=  28/7

x= 4

d) 4==========6
     20=========x

4x= 20 x 6

4x = 120

x= 120/4

x= 30