Question

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?
请问这道题什么意思，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

Answer 1

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。