GWD 数学一道2，弱弱的问牛牛

Max has $125 consisting of bills each worth either $5 or $20.  How many bills worth $5 does Max have?

(1)     Max has fewer than 5 bills worth $5 each.

(2)     Max has more than 5 bills worth $20 each.

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.

我感觉选B，但答案是D，A也能保证吗？

在下我也覺得是D...假如設X為$5的張數~~Y=$20的張數

可列出式子:5X+20Y=125   Max的帳單不是$20就是$5~~條件1--X<5 中 ,只有X=1的時候Y不會是個小數..(而帳單這種東西也不可能會有負數)

                                                條件2--Y>5 也只有Y=6 這個答案!!

故選D囉  希望有幫到你囉!!加油