DAY4-數(shù)學長難例：AtacertaincollegetherearetwiceasmanyEnglishmajorsashistorymajorsandthreetimesasmanyEnglishmajorsasmathematicsmajors.Whatistheratioofthenumberofhistorymajorstothenumberofmathematicsmajors?WhatisthethreetimesastherearetwiceasWhatisthethreetimesastherearetwiceas

English

mathematicsthenumberofhistory thenumberofmathematics倍數(shù)關(guān)系“twiceasmany……as，threetimesasmany……as”比率表達“theratioof……to……”Acertaincitywithapopulationof132,000istobedividedinto11votingdistricts,andnodistrictistohaveapopulationthatismorethan10percentgreaterthanthepopulationofanyotherdistrict.Whatistheminimumpossiblepopulationthattheleastpopulateddistrictcouldhave?istobe（1）Acertaincity/withapopulationofistobeWhatistheminimumdistricts,/andnodistrictistohaveapopulation/thatismoreWhatistheminimumpopulation/thattheleastpopulateddistrictcould除法“apopulationof132,000istobedividedinto11voting“apopulationthatismorethan10percentgreaterthanthepopulationofanyotherdistrict”會超過10%。請問人口最少的區(qū)域的最小可能人口是多少？TherateofacertainchemicalreactionisdirectlyproportionaltothesquaretheconcentrationofchemicalApresentandinverselyproportionaltotheconcentrationofchemicalBpresent.IftheconcentrationofchemicalBisincreasedby100%,WhatisthepercentchangeintheconcentrationofchemicalArequiredtokeepthereactionrateunchanged?isdirectlyproportionaltotheisdirectlyproportionaltotheTheinverselyproportionaltooftheconcentrationofchemicalinverselyproportionaltowhatisthepercentofchemicalBpresentIftheconcentrationofchemicalBisincreasedby100%, intheconcentrationofchemicalA/（原句直接修飾，也可理解為省略了定語從句的引導詞thatis）requiredwhatisthepercent比率表達“theratio比例關(guān)系“directlyproportionalto…andinverselyproportionalto（正/反比例）百分比變化“increasedby100%”AB的含量B100%，那么化學物質(zhì)ABeforebeingsimplified,theinstructionsforcomputing etaxinCountryRweretoadd2percentofone'sannual etotheaverage(arithmeticmean)of100unitsofCountryR'scurrencyand1percentofone'sannual and1of100and1of100weretoadd2

tothetothe上該國100單位貨幣和該人年收入1%的算數(shù)均值。Amy'sgradewasthe90thpercentileofthe80gradesforherclass.Ofthe100gradesfromanotherclass,19werehigherthanAmy's,andtherestwerelower.IfnoothergradewasthesameasAmy'sgrade,thenAmy'sgradewaswhatpercentileofthegradesofthetwoclassescombined?Amy'sgradewas/the90thpercentile/ofthe80gradesforherclass.OfAmy'sgradewas/Amy'sgradewas/IfnoothergradewasthesameasAmy'sgrade,thenofthe