Bheja fry question

 This question I heard it recently on web radio.

Question 

What to add in 70 to make it 17  ????

Question seems little weird. 

But it is said that something should be added to 70 to make it 17.

We will try to solve it in the arithmetic way. 

Let the number which is to be added is   ' x '.

70  +  x   =   17

Solving the above equation, we get 

X    =   17  -  70

X    =    - 53

Answer is 

If we add    - 53   to  70, then it will be 17  !!!!