有两道GWDl的数学题，向各位牛牛求助

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.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

Answer: D

只知道附加条件一为何正确，条件二为什么正确一直没想清楚，请牛牛指点指点！

第一题没漏什么东西吗？

第二题

一个正整数n，会被称作为“prime-saturated” 在这样一个情况下：如果所有不同正质因子的积小于n的平方根的话。 那么最大的“prime-saturated”两位整数是多少？