How much is `p-2q+3r` less than `3r+5`?

How much less is 2p-3q+r than 3p+4q-6r ?

How much is 2a^2-7a+5 less than a^3-3a^2+2a-3?

How much is 2a^2-7a+5 less than a^3-3a^2+2a-3?

Three numbers p,q and r are such that p is 200/3% less than q and q is 40% less than r. Find p/q + q/r + p/r .