When can we add 2 to 11 and get 1 as the correct answer?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

What is the next number in this series?

4,12,84,3612....

A man has to get a fox, a chicken, and a sack of corn across a river.

He has a rowboat, and it can only carry him and one other thing.
If the fox and the chicken are left together, the fox will eat the chicken.
If the chicken and the corn are left together, the chicken will eat the corn.

How does the man do it?

Can you replace the question mark with the correct number?

10+10 and 11+11 can give you the same answer.

Explain how?

Find the last number in the series below:

voN luJ yaM raM ---

I know a nine-letter word having only one vowel.
Do you ?