Mathematics

In figure 6, what value of $$Y$$ will make $$POQ$$ a straight line,


SOLUTION
$$\angle POR + \angle QOR=180^{\circ}$$
$$2y-25^{\circ}+3y^{\circ}+5^{\circ}=180^{\circ}$$
$$5y-20^{\circ}=180^{\circ}$$
$$5y=180^{\circ}+20^{\circ}$$
$$5y=200^{\circ}$$
$$y=\dfrac{200^{\circ}}{5}$$
$$=40^{\circ}$$
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