作业帮sat og test1 section7 q8+q10
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sat og test1 section7 q8+q10
sat og test1 section7
8:In an election 2.8 million votes were cast and each vote was for either Candidate I or CandidateII.Candidate I received 28,000 more votes than CandidateII.What percent of the 2.8 million votes were cast for Candidate
A.50.05% B.50.1% C.50.5% D.51% E.55%
10:When 1.783 is rounded to the nearest whole number,the result is how much greater than when 1.783 is rounded to the nearest tenth?
求具体解析、步骤、最好能提供sat og 所有具体解析材料、我在网上找的都没有数学部分的解析.急求、请尽快答复
sat og test1 section7
8:In an election 2.8 million votes were cast and each vote was for either Candidate I or CandidateII.Candidate I received 28,000 more votes than CandidateII.What percent of the 2.8 million votes were cast for Candidate
A.50.05% B.50.1% C.50.5% D.51% E.55%
10:When 1.783 is rounded to the nearest whole number,the result is how much greater than when 1.783 is rounded to the nearest tenth?
求具体解析、步骤、最好能提供sat og 所有具体解析材料、我在网上找的都没有数学部分的解析.急求、请尽快答复
8. 设投给Candidate I的票数为x,则投给Candidate II的票数为2.8*10^6-x,由题目知
x - (2.8*10^6-x) = 28000, 解得 x = 1.4 * 10^6 + 14000
从而百分比为 (1.4 * 10^6 + 14000) / 2.8*10^6 = 50.05%, 选A
10. 1.783四舍五入到最近的整数是2,1.783四舍五入到最近的0.1精度是1.8
故 (2-1.8)/1.8=1/9,即2比1.8大0.2（绝对值）或大1/9（相对值）
x - (2.8*10^6-x) = 28000, 解得 x = 1.4 * 10^6 + 14000
从而百分比为 (1.4 * 10^6 + 14000) / 2.8*10^6 = 50.05%, 选A
10. 1.783四舍五入到最近的整数是2,1.783四舍五入到最近的0.1精度是1.8
故 (2-1.8)/1.8=1/9,即2比1.8大0.2（绝对值）或大1/9（相对值）