Number Puzzles – 6

four way missing number problem

In the above picture one number is missing. Try to find out the number with in two minutes.

The correct answer is 28

Explanation:

The center number is the addition of each digits.

2+(1+2)+(1+8)+7=21

(1+1)+6+(2+3)+7=20

(1+8)+8+3+(1+7)=28

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