英语翻译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?
问题描述：
英语翻译
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?
答
大概意思是：
学校订购了价值600美元的灯泡。一些灯泡1美元和一些2美元。如果1美元的是2美元的两倍多，一共多少灯泡？
设x只2美元的，则有2x只1美元的。
2·x + 1·2x = 600
x = 150
所以一共有150+150x2=450只灯泡。
希望能帮到你~
答
一所学校订购了价值600元的灯泡.有些灯泡价格为1元和另一些2元.如果1美元的是2美元的两倍多,一共买了多少个灯泡?