Albert lived in the 18th century. His birthday was on 1st January in a year which was a perfect cube and he died on his birthday in a year which was a perfect square. How long did he live?
In a class of 20 pupils, 12 have mobile phones. Those without phones send cards to everyone in the class while the people with mobile phones send text messages to the others with phones and cards to the rest. How many cards are sent in all?
