Very tricky arithmetic! Note: This must be done in your head only. Do NOT use paper and pencil or a calculator. Try it:

Take 1000 and add 40 to it. Now
add another 1000 . Now add 30 .
Add another 1000 . Now add 20 .
Now add another 1000
Now add 10 . What is the total?
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Answer 3: Did you get 5000 ? The correct answer is actually 4100. If you don’t believe it, check it with a calculator