Question

x - 25%x = \(\dfrac{1}{2}\)

Answer 1

\(x-25\%x=\dfrac{1}{2}\\ x-\dfrac{1}{4}x=\dfrac{1}{2}\\ x\cdot\left(1-\dfrac{1}{4}\right)=\dfrac{1}{2}\\ x\cdot\dfrac{3}{4}=\dfrac{1}{2}\\ x=\dfrac{1}{2}:\dfrac{3}{4}\\ x=\dfrac{2}{3}\)

Answer 2

\(x-25\%x=\dfrac{1}{2}\\ x\left(1-25\%\right)=\dfrac{1}{2}\\ x\left(100\%-25\%\right)=\dfrac{1}{2}\\ x\cdot\dfrac{3}{4}=\dfrac{1}{2}\\ x=\dfrac{1}{2}:\dfrac{3}{4}\\ x=\dfrac{1}{2}\cdot\dfrac{4}{3}\\ x=\dfrac{2}{3}\)

Vậy \(x=\dfrac{2}{3}\).