The statement is reversed. The more dense plate will be forced under the less dense plate. This is discussed in thre site below. Scroll down about half way on the page.
There doesn't appear to be anything fundamentally wrong with the question you've provided. However, it is worth noting that in some cases, when plates collide, the denser plate may actually subduct beneath the less-dense plate rather than ride over it. This depends on various factors such as the angle of collision, the type of plate boundaries involved, and the specific characteristics of the plates involved.
