You see me once in June, twice in November and not at all in May. 
What am I?

333 + 555 = 999
123 + 456 = 488
505 + 213 = 809
344 + 732 = ???

I am something I am hard to leave but easy to go. 
What am I?

Where does Wednesday come after Friday?

I am a fruit. I am tasty and provide lots of energy. You can also find me in a calendar. 
What am I?

A man and his boss have the same parents, but are not siblings. 
How is this possible?