Răspuns:

Explicație pas cu pas:

2/3 = x/12

2*12 = 3*x

24 = 3*x

x = 24 : 3 = 8

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x/3 = 6/9

9*x = 3*6

9*x = 18

x = 18 : 9 = 2

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16/10 = x/5

5*16 = 10*x

80 = 10*x

x = 80 : 10 = 8

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x/4 = 3/2

2*x = 4*3

2*x = 12

x = 12 : 2 = 6

___________

x/10 = 2/5

5*x = 2*10

5*x = 20

x = 20 : 5 = 4