the three angles of a triangle are in the ratio 1:2:1 find the angles of the triangle

Suppose three angles of triangle are x, 2x and x respectively.
Since the sum of three angles of triangle is 180 degree. So we have;
$$\begin{gathered} x+2x+x=180 \\ \Rightarrow 4x=180 \\ \Rightarrow x= \frac{180}{4}=45 \\ \mathrm{So} \mathrm{the} \mathrm{angles} \mathrm{of} \mathrm{triangle} \mathrm{are} 45, 45 \mathrm{and} 45\times 2 \mathrm{i}.\mathrm{e}.90. \end{gathered}$$