Aubree saw 20 beavers and 40 chipmunks by a tree when going to school and scared them away when they saw her. While coming back from school, she realized the number of beavers had doubled and the number of chipmunks had decreased by 10. What's the total number of animals she saw that day? Think carefully first, then make a decision:
When going to school, she saw 40 + 20 = 60 animals. The number of beavers doubled to 20 * 2 = 40 beavers. The number of chipmunks decreased to 40 - 10 = 30 chipmunks. The total number of animals she saw on that day is 30 + 40 + 60 = 130 animals. So, the answer is 130.