as much as three hours还是as many as three hours?

as much as three hours还是as many as three hours? as much as 8 hours? i have three times as many as you 为什么不是as much as? Class 4 raised three times___class 5.A as much as B as many they spent as many hours as they could_____their lessons? They spent as many hours as they could -----their lessons 改错:She has three times as much books as I There are three times as many girls as boys There are three times as many girls as boys. there are three times as many girls as boys是什么意思 there are three times as mang girls as boy 中as many girls as as...as...she has three times as many books as I have.帮忙分析一下