At gumdrops galore candy store, Jake and his sister each fill a bag with gumdrops. Jake's bag of black gumdrops weighs 1/8 of a pound. Jake pays for both his gumdrops and his sisters' red gumdrops. In all, Jake buys 3/4 of a pink of gumdrops. He wants to know how much his sisters red gumdrops weigh.