SAT数学题A school ordered $600 worth of ligthbulbs.Some of the

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SAT数学题
A school ordered $600 worth of ligthbulbs.Some of the lightbulbs cost 1$ each and the others cost 2$ each.If twice as many 1$ bulbs as 2$ bulbs were ordered,how many lightbulbs were ordered altogether?
尤其是不能理解 If twice as many 1$ bulbs as 2$ bulbs were ordered是什么意思
清说清楚点,这种比较级的用法

twice as many A as B是A是B的两倍的意思.
这道题的大概意思就是：
一学校要买总共价值600美元的两类灯泡,分别1美元/个和2美元/个,如果1美元灯泡的数量是2美元灯泡的两倍,总共要买多少个灯泡?
如此一来这道题就好解了,总共要买的灯泡数量=600×1.5/2=450个.

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