First, I would draw a diagram.

Second, Label the diagram Flow in, Split 1, & Split 2.

Third, I would convert the the Flow In components from % to kg/hr.

Fourth, I would calculate the Split 1 components in terms of kg/hr

Mass flow is conserved, so Split 2 can be calculated from simple subtraction. Split (a) = Flow In (a) - Split 1 (a)

You know the total flow of Split 2, so percentages can be calculated.

Flow In

total 100 kg/hr

Et 50% 50

Me 10% 10

H20 40% 40

Split 1 Split 2

total 60 kg/hr total 40 kg/hr

Et 80% 48 kg/hr Et 2 5%

Me 15% 9 kg/hr Me 1 3%

H20 5% 3 kg/hr H20 37 93%