SAT OG 2道数学题 ,帮忙讲解一下哈～～ 在线等
A measuring cup contains5/1 oforange juice.it is then filled to the 1 cup mark with a micture that contains equal amounts of orange,grapefruit,and pineapple juces.what fraction of the final mixture is orange juice?
In the xy-plane,line L passes through the origins and is perpendicular to the line 4x+y=k,where k is a constant.if the two lines intersect at the point (t,t+1),what is the value of t?
A -4/3
B-5/4
C3/4
D5/4
E4/3