数学疑难题目

Rachelchen2012

本人菜鸟，数学不好，请各位大仙指导！求解疑问题目，都是OG13上的。。。谢谢！
1. On a certain day, orangeade was made by mixing a
certain amount of orange juice with an equal amount
of water. On the next day, orangeade was made by
mixing the same amount of orange juice with twice
the amount of water. On both days, all the orangeade
that was made was sold. Ifthe revenue from selling
the orangeade was the same for both days and ifthe
orangeade was sold at $0.60 per glass on the first
day, what was the price per glass on the second day?
(A) $0.15
(B) $0.20
(0 $0.30
(D) $0.40
(E) $0.45
2. In the figure shown, what is the value of
v+x+y+z+w?（图形是一个五角星，OG13 P21第10题）
(A) 45
(B) 90
(0 180
(D) 270
(E) 360  
3.Amarketing firm determined that, of 200 households
surveyed, 80 used neither Brand Anor Brand B soap,
60 used only BrandAsoap, and for every household
that used both brands of soap, 3 used only Brand B
soap. Howmany of the 200 households surveyed used
both brands of soap?
(A) 15
(B) 20
(0 30
(D) 40
(E) 45
4. Ofthe companies surveyed about the skills they
required in prospective employees, 20 percent
required both computer skills and writing skills. What
percent of the companies surveyed required neither
computer skills nor writing skills?
(1) Of those companies surveyed that required
computer skills, half required writing skills.
(2) 45 percent of the companies surveyed required
writing skills but not computer skills.