I need someone to solve this word problem. TEN POINTS TO BEST ANSWER?

After thanksgiving dinner, Grandmother puts a large tray of mints on the Coffee table by the TV for people to munch on while they watched the football game. Uncle Frank loves to eat mints, and he managed to eat half of them during the game. My father almost did as well as Uncle Frank; he ate one third of all the mints. Grandfather isn't supposed to have any mints, but he took the last reamaning three. How many mints did Grandmother put on the table originally? Best Answer gets ten points