F.1 Maths 要STEP
2011-06-09 1:54 am
The cost of painting the ceiling and the four walls of a rectangular hall is $5200 at the rate of $4 per square metre. If the length and breadth of the hall are 25m and 30m respectively, find the height of the hall.
回答 (1)
2011-06-09 2:11 am
✔ 最佳答案
Let x be the height of the hall.[2(30x)+2(25x)+(25*30)]/4=5200
[(110x)+750]/4=5200
110x+750=20800
110x=20050
x=182(corr.to nearest integer)
the height of the hall is 182M.
2011-06-08 22:59:44 補充：
唔明就要問啦 =]
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110608000051KK00742