In a car park,there are thrice as many cars as vans.The numb

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In a car park,there are thrice as many cars as vans.The number of cars is twice the number of motorcycles .Total number of wheeks these vehicles have is 4598.
A) How many cars are parked at the park.
B) If (fraction) 1-3 of the motorcycles left the car park,how many vehicles are left in the carpark?

A)cars:2508; vans:836; motor cycles; 1254
B)4180
再问： Thanks!
再问： Steps?
再答：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.
再问： 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 $1.50 more than a stalk of orchid,find the cost of a stalk of orchid.
再问：这个知道吗？有劳了
再问：其实我是在帮同学找答案
再答：答案：3.5$. 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+1.5 3a*(b+1.5)+ab=703 3a*(b+1.5)-ab=437 可解得ab=133，a=38 所以b=3.5
再问：谢谢你了！

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