Q!

iamliz

If w and c are integers, is w > 0?

(1)     w + c > 50

(2)     c >48

为什么不是B？

B单独和w没关系

Q30:

Joanna bought only $0.15 stamps and $0.29 stamps.  How many $0.15 stamps did she buy?

(1)     She bought $4.40 worth of stamps.

(2)     She bought an equal number of $0.15 stamps and $0.29 stamps.

为什么答案是C不是（1）是如何求出的 呢？

15x+29y=440 这是条件1，xy均为整数的话貌似只有一组解 A应该是对的吧

Q29:

June 25, 1982, fell on a Friday.  On which day of the week did June 25, 1987, fall?  (Note: 1984 was a leap year.)

请问除了推算法，有其他相关解法吗？

记住闰年向后推两天其他推一天就行了，比如1982年某日是周一，1983年就是周二，应为1984年是闰年，所以后推两天是周四。不过要看这个日子是在2月29号之前还是之后。

Q32:

For a convention, a hotel charges a daily room rate of $120 for 1 person and x dollars for each additional person.  What is the charge for each additional person?

(1)     The daily cost per person for 4 people sharing the cost of a room equally is $45.

(2)   The daily cost per person for 2 people sharing the cost of a room equally is $25 more than the corresponding cost for 4 people.

                  

（1）如果用（120+3X）/4=45  不是可求出吗？

 答案为什么是B 呢？？

我也觉得（1）是对的，选D吧。

这些是哪的题 答案权威么