How many consecutive zeros are there in $$A$$ if $$A=\underbrace{5\times 5\times 5\times \cdots \times 5}_{{{15}}}\times \underbrace{2\times 2\times 2\times \cdots \times 2}_{{{10}}}$$. 
Overseas Competition->Knowledge Point->Number Theory Modules->Prime Factorization->Applying Prime Factorization->The Number of Zeros at the end of a Product