There are 40 + 70 = <<40+70=110>>110 oranges and apples altogether .
He sold 40 x .25 = <<40*.25=10>>10 pieces of oranges.
He sold 70 x .50 = <<70*.50=35>>35 pieces of apples.
So, Tom was left with 110 - 10 - 35 = <<110-10-35=65>>65 pieces.
#### 65