1.therearetwokindsofsweetwaterAandB.acontains270gramsofsugarand30gramswater.Bcontains400gramsofsugarand100gramsofwater.nowiwanttoget100gramssweetwaterwhichis82.5%concentrated.whatistheweightofAandBrespectivelydoweneed?
2.thereare10litersofalcoholinacontainer.afterpouringoutoneliter,fillitupwithsomewater;thenrepeattheexperimenttwice.whatistheconcentrationofalcoholinthecontainernow?
3.therearesomekilosofsaltwaterwhichis4%concentrated,itbecomes10%concentratedafterevaporating,thenitbecomes6.4%concentratedafteradding300gramsofsaltywaterwhichis4%concentrated.howmanykilosofslatywaterarethereoriginally?
4.thesaltywaterbecomes3%concentratedafteraddingsomewateratthefirsttime.thenafteraddingthesamegramsofwater,itbecoms2%concentrated..what'stheconcentractionofthesaltywaterafteraddingthesamegramsofwateratthethirdtime?
5.therearethreekindsofsaltwater-----A,BandC.mixAwithBbytheproportionof2:1,themixtureis14%concentrated.ifA,B,andCaremixedbytheproportionof1:1:3,thentheconcentrated,howmanygramsof70%concentrationof