1. "See that car, Dad," Doug said suddenly. "Its number is ours, except that they've got our last pair of digits in front of our other three." "That's a coincidence," his father commented. "But what's all your figuring about?" "Something else I found," the boy replied. "Their number is one less than half ours." What were the numbers?

30406 and 40636

40608 and 60848

10204 and 20410