其它
When Pinocchio lies, his nose gets 6 cm longer. When he tells the truth, his nose gets 2 cm shorter. When his nose was 9cm long, he told three lies and made twotrue statments. How long was Pinnochio\textquotesingle s nose afterwards? 
Overseas Competition->Knowledge Point->Counting Modules->Law of Addition and Multiplication
9 + (3 x 6) - (2 x 2) = 23cm. 