Hard Math Riddle

Can you solve this math riddles???

Take 9 from 6, 10 from 9, 50 from 40 and leave 6.

How Come ??

 

For Answer

First use your mind, then click to see the answer

SIX – 9 (IX) = S 9 (IX) – 10 (X) = I 40 (XL) – 50 (L) = X ===>SIX