A.mp/1000+17m B.1000mp/1000+17m C.1000m/(1000+17m)p D.1000mp/1000+35m
A.1000x/18(1-x) B.1000x/[17x+18(1-x)] C.1000xp/18-x D.1000xp/[35+18(1-x)]
A.1000x/17x+18(1-x) B.1000x/18(1-x) C.1000x/35+18(1-x) D.1000xp/18(1-x)