If `3x+4:x+5` is the duplicate ratio of `8:15,` find `x.`

Explanation

As `(3x+4):(x+5)` is duplicate ratio of `8:15`.

`:. (3x+4)/(x+5) = 8^2/15^2 = 64/225`

`=675x+900 = 64x+320`

`=>611x = -580`

`=> x = -580/611`