Question

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

How Come ??

Answer 1

If we take = 9 from 6 , then
= 9 - 6
= -3
And when,
10 from 9 , then
= 10 - 9
= -1
And when,
50 from 40, then
= 50-40
= -10