Answer:
When is 1500 plus 20 and 1600 minus 40 the same thing?
What can be seen but not touched?
I start with āeā end with āeā. I have whole countries inside me. What am I?
How many bricks does it take to complete a building made of brick?
What travels around the world without leaving the corner?
I am a room that has a roof but no walls. What am I?