There are 30 cars with 遮阳板, 20 with power window.How many cars are equipped with both? (1). There are total of60(?) cars and 15(?) equipped none. (Sufficient, 反正可以求出多少两种都有) (2). Only 45(?) had oneequipment (Sufficient) (2)我觉得不行哦 设only 遮阳板 x only power window y both a x+a=30 y+a=20 由2 x+y=45 x+y+2a=50 2a=5 a不是整数