GMAT
题目
Of 120 hotel rooms rented one night, some were suits rented for $115 each and the rest were double rooms rented for $85 each. If the total revenue from the room rentals ffor this night was $10890, how many suits were rented?
解析
设\( x \)为套房数量，\( y \)为双人间数量
\( x + y = 120 \)
\( y = 120 - x \)
\( 115x + 85y = 10890 \)
\( 115x + 85(120 - x) = 10890 \)
\( 30x = 690 \)
\( x = 23 \)
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