Question

tìm x: \(\dfrac{3}{x+5}\)= 15%

Answer 1

`3/( x + 5 ) = 15%`

`=> 3/( x + 5 ) = 3/20`

`=> x + 5 = 20`

`=> x=20-5`

`=>x=15`

Vậy `x=15` 

Answer 2

\(\Rightarrow\dfrac{3}{x+5}=\dfrac{3}{20}\)

\(\Rightarrow x+5=\dfrac{3.20}{3}\)

\(\Rightarrow x+5=20\)

\(\Rightarrow x=20-5\)

\(x=15\)

Answer 3