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Retired NBME 21 Answers

nbme21/Block 4/Question#25 (reveal difficulty score)
An 80-year-old woman cannot concentrate her ...
2.0 🔍 / 📺 / 🌳 / 📖
tags: calculation

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 +25  upvote downvote
submitted by flashvoyger(25)
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eTh tusinoqe is snikga uoy who mchu wrtae tsum the wanmo keat ni ot anatiinm hte emas iolmstl.aoy Thsi onwma kseta ni 405 msOm fo slouet pre .ady hiTs is a nuit fo mmntseeerua -- khtni fo it klie rsam.g

For reh to peek hte asme losiolaytm she tmus teecerx 054 smmO epr .ady heT lnyo ywa for reh to recxtee het osteul is aiv eth s.edyink The oyln ywa ofr hre nsykeid ot eecxret 540 Osmm is if eyth eeerctx 1 ltire fo rewat lao.s isTh is eht axm iocntntnecaro atht ehr yneisdk anc eopuc.dr H(re diksnye rea ont le“upwrof ou”ngeh ot eamk erh irenu yna remo cneeadcrtont nhta t)ath.

ihTs anowm si laso nogisl nroaeth ertil of tawer ot ,esecf naigswet adn o.tersiriapn Thsi is het esinlen“sib etrwa ”ssol. aTht mensa if ehs ngoisl 1 teirl of werat to twaes, oertirisnap dna eecsf rep day plus 1 rtile of awter to eiunr esbaeu(c seh sdeen to siloedsv rhe leutso ni !ignhse)ot,m orf erh dlobo to ysta eth saem llm,oyosiat esh tsum cpaeelr het rtwea esh otsl suth tms,u ta mu,imnmi dnkir 2 sleitr of rtwea per ady.

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jean_young2019  rtgea elxhTatanakpo!inn !ouy +
unknown001  shit is ayw sieera adn .irophemcesebnl tpi ; arde shalf rgyeoasv sirtf, dna hten rsbhu ghortuh l.onusaetcp +


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 +23  upvote downvote
submitted by cantaloupe5(87)
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e’hsS tgkinnia 054 mOms pre dya os she nsdee to terxece 504 Omsm erp ady ot namaitin elbimu.uqiir oYu cn’ta stuj xtceere sm’Osm yb shleemevts -- teyh veah ot be dsvisodle ni semo onumta fo atew.r

eL’ts say yuo rcetexe 054 msmO itwh 050 mL of rwtea -- atht enams ryuo skndyie rea ntetnrgiaccon eniru t:o

054 mOsm ÷ 050 mL = 900 OmmsL/

Btu het mmxuima isth l’asdy iskdeyn can ecntcoenatr euirn to si 540 Os/mL,m os she sah ot extreec mroe wtrea to get it atth tduiel. htaT otanum fo atrwe si 1 L, eecbusa 045 mmsO1/ L = 054 ms/.LOm

oNw ’rhstee oigtnnh gpsonitp ehr frmo nericxteg hte 504 Omsms ni na eenv mero edulti nueir -- fro elaepmx if seh dkarn an txare L fo waetr eon day, eht ysekdin dcolu egt dri fo htta aetrx L wthi the asme ntmauo fo 045 Omsm by dgiinlut teh ineru ot 045 sOmm ÷ 2 L = 225 sL/mOm. tuB het sotnqeui assk rfo eht mmnuiim taomun fo arwet -- whcih si 1 L yb teh niykdse (+ 1 L rfmo eth troeh tfufs rfo a talto of 2 )L.

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shieldmaiden  Tnhka oGd you lepexinda heewr thta irlte cmea rofm busecea ygrloFsheav usjt ootk it out a igacm tha nad I saw lplycetemo otls +
skonys  lWoud eb aetrs be cluddien in teh nnsiebesIl rWtae ss?lo +3
skonys  *my .:( +
ankigravity  S,o sa thonrae a,lmpeex if esh koot in 090 dasl/moymO fo ostel,u esh wdulo deen ot eruntia 2 L ot larec ahtt + 1 L mfro het torhe ffsut for a oltta fo 3 L? +


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 +15  upvote downvote
submitted by burningmoon(18)
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1e)rWt(a K1g =artewL1 /ms4Oer kt05amgw arLme=0/4m5wsOt Mweiatnr O2H ededne to essivldo 405 ouslet by idynke si 1L era)War2 ettw( ehOtr fecs(e te 1la)tl:.a=ToL rt)(1we+a =)ewr(a22Lt

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ali_hassan  shti si hwta i deedne +


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 +10  upvote downvote
submitted by yotsubato(1208)
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sihT qntiueos si s.idutp Waetr iktnae ofr a hlhayet nuvliaddii si 20. L a a.yd

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 +7  upvote downvote
submitted by madeforupvoting2(16)
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oT nnaaimit pmlasa llstmoaoyi -gt;& edNe to txeacly arleecp all hte fdsiul lsto in the yda

hSe ocntna tcncoernaet ruien obeav 054 gmsm/Ok , so the unmmmii tnuoma fo teraw idereruq to be exedretc by iyndkse is 1 o(t eetrcex hte 045 msmO hes aacustclmeu pre a.)dy heT inmmuim ornexctei tarew ruqereid si slerynascie at max nce;ontnoarcit fi ouy eewr ot say oeucprd irueldt ie,unr ays mm,2s/kO5g2 siht oduwl rruqiee 2 L of ewt.ra ehT enitusqo anwst teh iuinmmm bilospse rteaw m,olevu os ew smusae hss’e tncatrgnconie ot teh xm.a

1 L sossel morf yenkid + 900 mL nseinliesb + 100 Lm ni wtesa dan eecsf = 2L elosss &;gt- eend to setign 2 L fo wrtea to e.rclepa

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jesusisking  So felh,plu tnahk u!oy +


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 +1  upvote downvote
submitted by misrao(5)
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nCa seeoomn lianpex het enraotrlico eetbewn 504 Osm/loaymd nad eninegd to xecreet 1 L of tw?era Tnhkas

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trazobone  Tsih is my cedsno itme godni hsti oqusniet YT VDI.OC ehT oniedintif of an Oms si the mernbu of omeosls of olsuet rep eltir of ltsve.no hTe tmse tslle yuo teh shgiteh seh anc erteacncnto her reniu si 045 mOm/okslg ,O2H and hse teska in 450 daOs/ymom.l She osla slsoe 0100 mL omrf atew,s e,sfec .ect. The sommlO iareblavs rae OTN rleaedt to teh 0001 .mL It is gnigo ot ekta 1 ilert to ntoncetreac tath 540 lmOmos uier,n dan hse saol eosls a atesaper uneadtelr 1 et.ril e,ehtrTog the unmmiim muotna of 2OH dedene is onigg ot be 2 lserti. +


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 +1  upvote downvote
submitted by trazobone(97)
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hTis si ym cdenso item igdno htsi uqtnseio YT O.CIDV ehT fntiniideo of na mOs si teh eunbmr fo ooeslms of soulet per ierlt fo otnv.sle Teh esmt sletl uyo eth hhisegt she nca neecctatnor hre riuen si 405 lgosm/mkO 2OH, dna she kesat ni 504 msyoa/m.lOd heS sloa olsse 1000 Lm ormf es,atw se,cfe te..c hTe mlOoms sarieavlb are NTO edtarel to teh 0001 m.L tI is inogg ot take 1 eirlt ot rtotceecann atht 045 lsmmoO iernu, adn esh lsao esols a aeretasp trnlueaed 1 .ertli rtegeh,oT het iummnmi mtouan of 2HO eedned si ogign to eb 2 ilrtse.

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