I grew up, asked the question to many, but I never satisfied with the answers I got. I asked the question to shopkeepers, housewives, philosophers, mathematicians, politicians, cashiers and many other people, but got different answers. Funny, stupid, puzzling ones.
When I asked the question to a to be mathematician, his reply was " 2+2 is equal to the square of 2. 2 is the only number which gives you the same answer if we add or multiply it with itself.
"But what is the answer?", I asked, "How much is 2+2?"
"Well, that is a simple mathematics," He said, "So find it yourself. If you have any question regarding advanced mathematics, let me know"
I remember that once I had a minor health problem so I went to a General Physician. But instead of telling the health problem, I asked him the mathematical problem, "How much is 2+2?"
"Let me check it," the Doctor said. Then he calculated it on a rough paper and said, "It is a complicated problem. But don't worry, I will refer you to a specialist, where you will get the right answer".
But instead of going to the specialist, I preferred to meet an Engineer, and asked him the question. He calculated it on his calculator for 15 minutes and then said, "It is approximately 4. To say more accurately, It is in between 3.99 and 4.01"
When I met a local politician friend in a late night party (a place for party politicians?), I asked the question and he gave me an answer in form of a lecture. The synopsis of his lecture was 2+2 is not 4. When two twos come together, it is equal to 22, just like 1+1 is 11.
One of my friends is a Chartered Accountant. When I asked him, "How much is 2+2?", without waiting he asked, "How much do you want it to be?"