Question

Qual é o valor de X nas proporções:
(x/3=40/15)
(x+3/8=5/4)
(x-10/8=15/4)
(2/x=12,5/25)

POR FAVOR

Answer 1

(x/3=40/15)

15x=120

x=120/15

x=8

(x+3/8=5/4)

(x+3).4=5.(8)

4x+12=40

4x=40-12

4x=28

x=28/4

x=7

(x-10/8=15/4)

(x-10)(4)=15(8)

-40+4x=120

4x=120+40

4x=160

x=160/4

x=40

(2/x=12,5/25)

12,5x=25(2)

12,5x=50

x=50/12,5

x=50.10/12,5.10

x=500/125

x=4