Question

quanto vale x nas contas


1/4 =2/x e 2/3 =x/21 e x/10 = 6/10 e 3/x =1/4

Answer 1

1  = 2
4     x

1x = 2.4
x = 8
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b)
2  =  x
3     21

3x = 2.21
3x = 42
x = 42/3
x = 14
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c)

x   =  6
10    10

10x =10.6
10x = 60
x = 60/10
x = 6
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d)

3  =   1
x       4

x = 3.4
x = 12