Question

sat og test1 section7 数学部份 q8+q10

sat og test1 section7 数学部份

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 I?
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
急啊、、、求速答！！！！！！！！

Answer 1

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）