A concession stand sold pizza slices, ice cream cones, and tacos at a basketball game. Pizza slices were sold for $3.00, ice cream cones were sold for $2.25, and tacos were sold for $1.50. The total number of pizza slices, ice cream cones, and tacos sold was 147, and the total amount of money from these items was $340.50. If $103.50 was made just from selling ice cream cones, how many pizza slices were sold?