A total of n trucks and cars are parked in a slot. If the number of cars is 1/4 the number of trucks, and 2/3 of the trucks are pickups, how many pickups, in terms of n, are parked in the slot?
A. 1/6n
B. 5/12n
C. 1/2n
D. 8/15n
E. 11/12n
Ans: D
我的算法是 :
n=trucks+cars
the number of cars is 1/4 the number of trucks,
表示cars : trucks = 1 : 4, 所以total可以看成5, 所以truck佔所有車子的比例是1/5, 然後有2/3的trucks pickups, 所以1/5nX2/3=2/15n
但是沒這個答案.
...。.:*．☆゜ﾟ▽ﾟ)oﾟ▽ﾟ)o ☆.。:*．!!
