1.

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

Answer» 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`


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