A)cars:2508; vans:836; motor cycles; 1254
B)4180Thanks!Steps?记the number of cars为a，则the number of vans 为1/3a，而the number of motorcycles 则为1/2a。So, a+1/3a+1/2a=4598，由此可得a=2508。B) motorcycles ：b=1/2a=1254，所以1/3b=1254*1/3=418，4598-418=4180.On teachers day,a florist sold thrice as many roses as orchids and collected $703 in total. She collected $437 more for the roses than the orchids. Given that a stalk of rose cost $1.50 more than a stalk of orchid,find the cost of a stalk of orchid.这个知道吗？有劳了其实我是在帮同学找答案答案：3.5$.过程：记orchids卖了a朵，则rose卖了3a朵；记orchid单价b$，则rose单价为b+1.53a*(b+1.5)+ab=7033a*(b+1.5)-ab=437 可解得ab=133，a=38所以b=3.5谢谢你了！