IKMC 2018 - Grades 11-12 - Set 2 - Self-study Question 11

Question 11

Two cubes have volumes V and W and overlap. The part of the V-cube outside the overlap is 90% of V; the part of the W-cube outside it is 85% of W. Which relation holds?

Question illustration

$V=\frac23W$
$V=\frac32W$
$V=\frac{85}{90}W$
$V=\frac{90}{85}W$
$V=W$