Answer:
A prisoner is told 'If you tell a lie we will hang you if you tell the truth we will shoot you.' What can the prisoner say to save himself?
I am often sold by children entrepreneurs in summer time
I have 24 keys but cannot open any locks. Sometimes loud sometimes soft
You heard me before and then again. Afterward I die until you call me again.
I am all around you, but you cannot see me. I have no throat, but you can hear me. Valued during summer but despised in the winter. What am I?
No matter how little or how much you use me, you change me every month.