Explanation:
the inner WU arc angle is 23x - 5.
the outer WU arc angle is 37x + 5.
together they must be 360°, as this is the full circle.
so, we have
360 = 23x - 5 + 37x + 5 = 60x
x = 6
therefore, the angle at V is
V = 5x + 17 = 5×6 + 17 = 30 + 17 = 47°
inner WU arc angle = 23x - 5 = 133°
outer WU arc angle = 37x + 5 = 227°
this also fits with
V = (outer arc angle - inner arc angle)/2 =
= (227 - 133)/2 = 94/2 = 47°