Can you replace the question mark with the correct number?

What can you see in the middle of March and April that you can never see in any other month?

A car meter reading shows 72927 miles a palindromic number.
what is the minimum number of miles you would need to travel to see another palindromic number on the car meter reading?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

John was drowned by he was not wet. How?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

What makes this number unique: 8,549,176,320?

What does an Island and the letter T have in common?