Find the angle whose supplement is four times its complement.

Two complementary angles are in the ratio $4:5$Find the angles.

 Find the value of $x$ for which the angles $\left(2x-5\right)°$ and $\left(x-10\right)°$ are the complementary angles.

In the adjoining figure, $AOB$ is a straight line. Find the value of $x$.

In the adjoining figure, $AOB$ is a straight line. Find the value of $x$. Hence, Find $\mathit{\angle }AOC$ and $\mathit{\angle }BOD$.

In the adjoining figure, AOB is a straight line. Find the value of$\mathrm{x}$. Hence, find $\angle \mathrm{AOC}, \angle \mathrm{COD} \mathrm{and} \angle \mathrm{BOD}$.

In the adjoining figure, $\mathrm{x} : \mathrm{y} : \mathrm{z} =5:4:6$. If $\mathrm{XOY}$is a straight line, find the values of $\mathrm{x}, \mathrm{y} \mathrm{and} \mathrm{z}$.

In the adjoining figure, what value of $x$ will make $\mathrm{AOB},$a straight line?