Answer : The correct answer is Liquid B will remain at top.
When two liquid are combined , they settle on the basis of their densities . The liquid with lower density will remain at top while the liquid with higher density will settle at bottom .
So we will calculate densities of two liquids. The formula to calculate density is
Density = mass / volume
GIven : Liquid A => mass = 10 g volume = 5 mL
Density = 10 g / 5 mL
Density = 2 g/mL
Liquid B => mass = 15 g volume = 10 mL
Density = 15 g / 10 mL
Density = 1.5 g/mL
Hence density of Liquid A is greater than Liquid B, so the liquid B will remain at top of graduated cylinder when they are combined.