x = y - (50/y), where x and y are both > 0
If the value of y is doubled in the equation above, the value of x will:
A. stay the same.
B. double.
C. increase to more than double.
D. increase four fold.
E. decrease.
Pick a number that satisfies the rules that x and y are greater than 0. So for example you could choose 25 for y.
The value of x before doubling is then 25 - 50/25 = 23
The value after doubling y will be 50 - 50/50 = 49, which is more than double.