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D) 1/2 :2/7= 3/4 x/1
1/2 x 7/2= 3/4 x 1/x
7/4= 3/4x
28x=12
x = 12/18
x=0,41
E) 1/5 :2/7 = 2/5 : x/1
1/5: 7/2 = 2/5 : 1/x
7/10= 2/5x
35x=20
x=0,57
1/2 x 7/2= 3/4 x 1/x
7/4= 3/4x
28x=12
x = 12/18
x=0,41
E) 1/5 :2/7 = 2/5 : x/1
1/5: 7/2 = 2/5 : 1/x
7/10= 2/5x
35x=20
x=0,57
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