A)cars:2508; vans:836; motor cycles; 1254
B)4180Thanks!Steps?記the number of cars為a，則the number of vans 為1/3a，而the number of motorcycles 則為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 $1.50 more than a stalk of orchid,find the cost of a stalk of orchid.這個(gè)知道嗎？有勞了其實(shí)我是在幫同學(xué)找答案答案：3.5$.過程：記orchids賣了a朵，則rose賣了3a朵；記orchid單價(jià)b$，則rose單價(jià)為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謝謝你了！