Question

(28- x) : x = 16 : 48
(15 + x) : x = 45 :20
72 : 18 = (10 - x) : x

x : (56- x) = 48 : 16
20 :4 = (5+ x) : x

Answer 1

(28-x):x=16:48   /×  x

28-x=⅓x

28=⅓x+x

28=⁴/₃x

x=28:⁴/₃=21

 

(15+x):x=45:20  /× x

15+x=2,25x

15=2,25x-x

x=15:1,25=12

 

72:18=(10-x):x  /×  x

4x=10-x

4x+x=10

x=10:5=2

 

x:(56-x)=48:16  /×(56-x)

x=3(56-x)

x=168-3x

x+3x=168

x=168:4=42

 

20:4=(5+x):x  /×  x

5x=5+x

5x-x=5

x=5:4=1,25

 

 

 

(28-x)/x=16/48

(28-x)/x=⅓

x=3[28-x]

x=84-3x

x+3x=84

x=84;4=21

 

(15+x)/x=45/20=9/4

9x=4[15+x]

9x=60+4x

9x-4x=60

x=60:5=12

 

72/18=(10-x)/x

4/1=(10-x)/x

4x=10-x

4x+x=10

x=10:5=2

 

x/(56-x0=48/16=3/1

x=3[56-x]

x=168-3x

x+3x=168

x=168;4=42

 

20/4=[5+x]/x

5/1=[5+x]/x

5x=5+x

5x-x=5

x=5:4=1,25