Question

$\frac{x+1}{5}= \frac{2x+6}{15}$

Answer 1

x + 1         2x + 6
--------  =  -----------
   5               15

15.(x + 1) = 5.(2x + 6)

15.(x + 1)          2x + 6
--------------   =
      5

3.(x + 1) = 2x + 6

3x + 3 = 2x + 6

3x - 2x = 6 - 3

x = 3

Resp: x = 3