Question

como se resolve essas grandezas inversamente proporcionas
.Grandeza A Grandeza B
X 56
28 30

.Grandeza A Grandeza B
4 30
X 15
12 Y

.Grandeza A Grandeza B
X 5
30 2
60 Y

Answer 1

.Grandeza A Grandeza B
X 56
28 30

x  ------ 30
28 ------ 56

56x = 840
x = 840 / 56
x = 15

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.Grandeza A Grandeza B
4 30 
X 15
12 Y

x ------ 30
4 ------ 15

15x = 120
x = 120/15
x = 8

8 ----- y
12 ----- 15

12y = 120
y = 10
_________________________________

.Grandeza A Grandeza B
X 5
30 2
60 Y

x ---- 2
30 ---- 5

5x = 60
x = 12

30 ---- y
60 ----- 2

60y = 60
y = 1

Answer 2

.
Ola Eliane

a)

56x = 28*30
x = 28*30/56 = 30/2 = 15

b)

4*30 = 15x = 12y

x = 120/15 = 8
y = 120/10 = 12

c)

5x = 2*30 = 60y 

x = 60/5 = 12
y = 60/60 = 1

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