Question

Determine o valor de x nas proporções:
a)3x_5=60_2 b)x+2_4=25_2 c) 7_6=21_x

Answer 1

a)3x = 60

--- ----

5 2

3x . 2 = 60 . 5

6x = 300

x = 300

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6

x = 50

b) x + 2. 25

------- = -----

4. 2

2 . (x + 2) = 25 . 4

2x + 4 = 100

2x = 100 - 4

2x = 96

x = 96

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2

x = 48

c) 7. 21

--- = ---

6. x

7 . x = 21 . 6

7x = 126

x = 126

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7

x = 18