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题库 / Prep2007E1-DS-184
Jack and Mark both received hourly wage increases of 6 percent. After the wage increases, Jack's hourly wage was how many dollars per hour more than Mark's?
(1) Before the wage increases, Jack's hourly wage was $5.00 per hour more than Mark's.
(2) Before the wage increases, the ratio of Jack's hourly wage to Mark's hourly wage was 4 to 3.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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在工资增加之前，杰克的时薪比马克的每小时多5美元——这里不需要做代数运算:工资增加6%，他们之间的差值也会增加同样的6% so 新差值 5*1.06。sufficient
wage was how many dollars per hour more than Mark's 看清题！！！！！问的是数字不是比例！
应把问题用数学语言表达出来:Q: 1.06（J-M)=?
题目求的是，1.06J-1.06M=?
(1)J-5=M, 代进去直接是 1.06J-1.06J+1.06*5=1.06*5； 直接就是 多出来的5 乘上增长率就好了