Question

Determine mentalmente o valor de cada item de modo a obter proporções
A ) x/5=6/15
B) 8/x=2/7
C) 3/8=x+1/16

Answer 1

A) X/ 5 = 6/ 15
X.15 = 5 . 6
X.15 = 30
X = 30/15
X = 2
2/5 = 6/15

B)8/x = 2/7
 2 x = 8.7
2 x = 56
x = 56/2
x = 28

 c)3/8 = x + 1 / 16
8(x + 1 ) = 3.16
 8 x + 8 = 48
8 x = 48 - 8
8 x = 40
x = 40/8
x = 5
3/8 = 5 + 1 / 16
 3/8 = 6/16