Problem about finding distance with magnitude given
Short answer: no, you can't solve the question if all you know is its apparent magnitude. It could be a faint star that's nearby, or a very luminous star that's far away. (The Sun's parameters are irrelevant.)

(I'm ignoring the bit about it being "a star in the Pleiades", which implies that it's a physical member of the Pleiades cluster, in which you already know its distance: it's the same as the distance of the Pleiades cluster. Maybe you just meant "it's in the same part of the sky".)