The density of ice is x gm/cc. and that of water is y gm/cc. What is the change in volume in cc., when m gm of ice melts

Q: The density of ice is x gm/cc. and that of water is y gm/cc. What is the change in volume in cc., when m gm of ice melts ?
(A) m(y – x)
(B) (y – x)/m
(C) mxy (x – y)
(D) m (1/y – 1/x)

Solution: m = volume × density
Mass remains constant.
V_ice × ρ_ice = V_water  ×ρ_water
V_water = V_ice × ρ_ice/ρ_water
= m/y
ΔV = V_water – V_ice
= m/y -m/x = m(1/y – 1/x)