[計量] BB的題目
The daily rate for a hotel room that sleeps 4 people is $39 for one for
one person and X dollars for each additional person. If 3 people take the
room for one day and each pays $21 for the room, what is the value of X?
(A)6 (B)8 (C)12 (D)13 (E)24
ans:C
感覺題目怪怪的
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