Freezing point of a 4 aqueous solution of X is?

For the same freezing point, molality of both solutions should be the same.
mx=my
4 × 1000 / 96 × Mx = 12 × 1000 / 88 × My
My = 96 × 12 / 4 × 88 × Mx
My = 3.27 A ≈ 3A