Susie Starfish and her five sisters went to the cinema with Ollie Octopus and his four brothers.  They bought a box of popcorn for every arm they had.  How many boxes of popcorn did they buy? 
Overseas Competition->Knowledge Point->Word Problem Modules->Unitary Method Problems->Applying Multiplication and Division
There are $$6$$ starfish and $$5$$ octopuses. So the number of boxes $$=6 \times5+5\times8 =70$$. 