1. 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 =
2. Toy 1, 2, and 3 weigh 100kg. Toy 1 and 3 weigh 60.5kg. How much does toy 2 weigh?
Look at the table below.
5. If the pattern keeps going on, what will be the next 2 rows?