Math Riddle: Fill the Boxes: [] + [] + [] = 30

This is a tough riddle to crack.

The main issue here is that an addition of odd numbers for odd times will result in an odd number. So in no way will you get an even number like 30 by adding these odd numbers.

So you will have to think out of the box to solve this one.

Use of mathematical operator is a must.

To get an even number from an odd number the best operation to use would be factorial.

So we use 3!, (3 factorial)

3! = 3 x 2 x 1 = 6

Now you can fill the 3 boxes with the following;

3! + 15 + 9 = 30