Tricky Watermelons Maths Puzzle with Answer

Sometime from the puzzle statement, it looks like that puzzle is wrong or impossible to solve. However if one thinks out of box, then the puzzle look easy. Here is one such tricky Watermelon Maths Puzzles. Can you solve it?

Can you solve this Maths Puzzle?

Answer can be viewed by clicking on button. Please do give your best try before looking at the answer.

All the given numbers are Odd and adding three Odd numbers gives the Odd results. So some people will immediately think that this puzzle is impossible to solve. However if one think out of box and turn upside down the number 9 to make it 6 than it can easily solved by putting number 6, 11 and 13 to make the sum as 20.

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