Human: Matt rode his bike away from the house, he rode a total of 1000 feet.  Along the way, he passed a stop sign that was 350 feet away from his house.  He continued his ride and passed a second sign.  After passing the second sign he road an additional 275 feet.  How many feet are between the first and second signs? Assistant:
Matthew rode 350 feet to the first sign, so there are 1000-350 =650 feet between the first sign and the end.
After passing the second sign Matthew road 275, so 650-275 = 375 feet remain.