其它
What is the next number in the sequence below?  $$47, 44, 38, 29, 17, \cdots $$ 
Overseas Competition->Knowledge Point->Calculation Modules->Sequences and Number Tables->Patterns in Number Sequences
The pattern is: $$-3, -6, -9, -12, -15, \cdots $$  Thus, $$17-15=2$$ 