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题库 / GMATAdvanced-DS-22
At a certain university recreation center, a member can receive a 30-minute massage,a 60-minute massage, or a 90-minute massage and is charged $0. 50 per minute for each massage. A member receiving a massage is charged the same fixed amount for each additional service, such as nutrition advice or a fitmess evaluation. At this center, what is the total charge to a member for a 60-minute massage and 3 additional services?
(1)At this recreation center, Jordan, a member, had a massage and 3 additional services for a total charge of $37.50.
(2)At this recreation center, Ryan, a member, had a massage and 2 additional services for a total charge of $60.00.
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.
J = a message + 3 services
R = a message + 2 services
没有给 a message是哪一种message，所以符合条件的message需要代入算一下
J:
60mins: 3 s=7.5
30mins: 3 s=22.5 (x=7.5)
R:
90mins: 2 s=45
30mins: 2 s=30
30mins: 2 s=15 (x=7.5)
以上任一条件单独都不满足，但如果join在一起看，会发现30 mins的条件会让J和R的service cost都等于7.5，所以可以得出唯一解，选C
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