What is full of holes but still holds water?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

What number should come in place of the question mark below?

How is a fly different from a mosquito?

Outside a massage parlour, there is a board that reads
"I only massage those who do not massage themselves."

Reading the above statement, does the masseur massage himself?

If you had an infinite supply of water and 5-quart and 3-quart pails, how would you measure exactly 4 quarts? What is the least number of steps you need?

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

What can go through glass without breaking it?

what does the below rebus means?

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?