Grandpa went to the pond to feed the birds. He brought a bag with $40$ pieces of food. Then, Grandpa fed $4$ pieces of food to ducklings, $3$ pieces to seagulls, and $2$ pieces to swans. **Which number line shows how to find how many pieces of food Grandpa has left?** [[☃ radio 1]] **How many pieces of food does Grandpa have left?** [[☃ math-keypad 1]] pieces of food