The second answer is right because the numbers can be positive or negative. However, if one of them is positive, the other must be positive as well, and if one of them is negative, the other must be negative as well.
Let the bigger no be x & smaller no. be y.
Then,
x X y =3200 & x / y = 2, Therefore, x = 2y
Therefore, 2y^2 =3200
or, y^2 = 1600
Therefore, y = 40 &
x= 80.