Re: [計量] In a certain apartment building ...
※ 引述《shugh (我)》之銘言：
: BB P246 Q26
: In a certain apartment building exactly 1/3 of the apartment have two bedrooms
: and exactly 1/7 of the two-bedroom apartments are front apartments. Which of
: the following could be the total number of apartments in the building?
: ans.42
: 我想我不太懂題目的意思，連算都不知該從何算起，
: 煩請大家幫我解釋一下...
: 謝謝
某公寓大樓正好有1/3是兩房的，在這些兩房公寓中正好有1/7是正面的
問這棟大樓的公寓總數是多少?
假設總共是x間，則正面的就是1/3 * 1/7 * x = x/21
公寓數不可能有分數或小數，所以x/21必為整數，x要為21的倍數 = 21,42,63.....
這題有選項吧..
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