求高人指点,GMAT数学OG12223
SeedmixtureXis40percentryegrassand60percentbluegrassbyweight;seedmixtureYis25percentryegrassand75percentfescue.IfamixyureofXandYcontains30percentryegrass,whatpercentoftheweightofthemixtureisX?
A10%
B33又3分之1%
C40%
D50%
E66又3分之2%
答案是C,算不出来.
求帮忙.