ITMC 2018 Grade 7 National Preliminary set01 Question 20

Question 20

$ABC$ is equilateral and $WXVZ$ is a square as stated in the source (the drawing labels its upper-right vertex $Y$). Given $\angle CZY=40^\circ$, find $\angle XWB$.

Question illustration

$10^\circ$
$20^\circ$
$30^\circ$
$45^\circ$
$60^\circ$