Question

If you double a number and then add 1616​, you get two fifths 2 5 of the original number. what is the original​ number?

Answer 1

Let the original number be x.

Acc. to the question,
     2x+1616=(2/5)x
or, 10x+8080=2x
or, 10x-2x= -8080
or, 8x= -8080
or, x= -8080/8
or, x = -1010

Therefore, the original number is -1010