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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 iqtnsuoe si sgkian uyo woh much etwar mtus teh oamwn ekat in ot annitmai the msea ao.ltliymso ihTs naowm tskea ni 450 sOmm fo osuelt rpe ya.d shiT si a uitn fo msaeetrnmeu -- nktih fo ti ikle mgars.

orF her ot ekep teh sema oyiltmaols esh tmsu eectrex 504 Osmm erp da.y eTh oyln ayw ofr reh ot rexctee eth eoults si iav eht nseyk.id hTe olyn awy fro rhe ensdkyi ot ecerext 405 msmO si if thye exreetc 1 ltire of trwae l.soa Thsi si eht amx cantoocnnetir atht her ykiends can rcupo.de (rHe skndyie ear ont fl“peourw gnueoh” to maek rhe renui yan remo carcnnttoeed thna .ha)tt

hsTi mawon si sola nslgoi teahrno ertil fo wreta to ese,cf teswgnai and estpoiin.rra isTh is eth elnbisi“sne raetw .o”sls Taht enams fi ehs sognli 1 rltei fo etraw ot esta,w potenirrsia adn cfees per ayd uspl 1 erlti of ewatr to ienur becus(ae hse esned to oslvesdi ehr osteul ni tmeh),so!ign rfo ehr olbod to syat eht esma itysoaolml, ehs must reelpac eth reatw esh stlo usht stmu, at mumnmi,i kdirn 2 letrsi of trwea erp yda.

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jean_young2019  agetr nelaptxaTihonka!n uyo! +
unknown001  thsi si way areesi and s.emhopleecbinr t ip; erda hsfla ayvrsego frti,s nda nteh hbsru hutgrho lcastpenuo. +



 +23  upvote downvote
submitted by cantaloupe5(87)
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es’hS anniitkg 054 mOms rpe day os ehs esnde to eertxce 405 smOm rpe day to aaitninm .bmleqiuriiu ouY tan’c tsuj eecretx smmsO’ yb hesesvtelm -- yteh vhae ot eb osevsdild ni oesm uoatmn fo .waetr

’stLe yas ouy rxteeec 045 smmO hwit 050 mL of twera -- tath seanm oury edsiykn aer tiegnatncronc enuri :ot

405 sOmm ÷ 500 Lm = 090 mLOsm/

Btu hte ammuxmi hsti da’sly kedyins acn tonrnceaetc enriu to si 054 LOm,ms/ so esh sah ot xrteece orem artew to gte it atht .tldiue taTh amnotu fo wrtea is 1 ,L uecbeas 504 m1Os/m L = 540 m.sOL/m

oNw r’ehste hionngt gippntso hre rmfo geinrcetx eth 045 msmsO in an enve more ueltdi rinue -- fro amexlpe fi esh radnk an xraet L of eartw one ,day eth dkyinse lcduo teg idr fo ttha xaetr L thwi eht emas tmauon of 504 Omms by ldtuniig eht rnuie to 405 Omms ÷ 2 L = 252 /mmsLO. But teh sinuoteq kass ofr teh mmimiun otmnau of eratw -- icwhh si 1 L by the sekiydn +( 1 L ormf eth etroh fufst rfo a otlta of 2 .)L

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shieldmaiden  khTna oGd uoy xlipeadne heewr hatt irelt maec rmof buesaec elFragovhsy sjut otok it tou a agmci hat adn I wsa ylmleceotp lsto +
skonys  oldWu be tesar be liudcnde ni eht ibInsesenl etraW ?olss +3
skonys  my* :(. +
ankigravity  S,o sa erthaon lma,epex fi seh koot in 009 m/osmyladO of lesuto, hes wuodl ende ot triauen 2 L ot lcrea atht + 1 L rofm eth ohrte sftfu ofr a aoltt fo 3 L? +



 +15  upvote downvote
submitted by burningmoon(18)
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r(1t)aWe g1K aeLtrw=1 aOwgm4m/kt5s 0er 5maLret0ms4Ow=/ enrMitwa OH2 dednee ot sdovslei 054 losute yb ydienk is 1L rate a)rwWet(2 Otreh eefc(s et La.T:oa1t) =ll ar+(w)1et Lt2re)2wa(=

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ali_hassan  sith si awth i nddeee +



 +10  upvote downvote
submitted by yotsubato(1208)
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ishT eqiounts is .stdpui areWt etnkia rfo a yhealth iilnaduidv is 0.2 L a ady.

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 +7  upvote downvote
submitted by madeforupvoting2(16)
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oT aitniman aaspml sloaylimto -tg;& Nede ot xatclye prcleae all eht fsluid sotl in the dya

Seh ntoacn ortneatcnce urine aebvo 054 /Omsgkm , so teh ummniim noatmu fo eratw ruedireq to eb eexedrtc by dynekis si 1 ot( eetxrce the 054 Omms hse sucuemalcat rpe ).yad The minmimu eerotcnxi water ridreuqe is ssciereyaln ta max onietr;aonntcc if uyo eewr to yas uerdpoc eldutri nreui, ysa gOmm5ks2/2, shit odulw erueirq 2 L of twa.re The uqnsetio wtnas hte umimnmi selbopsi ewart lvemou, so ew esumas hes’s iannctgotencr ot eht ax.m

1 L elsoss rfom dnikey + 090 mL lssinenieb + 100 Lm in stwae dan sefce = 2L seosls g-;t& edne ot niegst 2 L of rwtea ot lecra.ep

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jesusisking  So pelhl,fu khnta oy!u +



 +1  upvote downvote
submitted by misrao(5)
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nCa omensoe lxnepai teh iocrrtolena webneet 540 /Osdomlmya dna edengni ot xeectre 1 L fo etawr? nhTaks

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trazobone  ihsT is my nsdoce meit gndio tsih ntosieuq YT OCV.DI The idtiofnnie of na msO is eht ebrnum of osoesml fo tsleuo rep tierl fo el.tvosn heT smte slelt you het shithge she cna ncenaorettc erh rinue is 054 Olmok/mgs H2,O nad she ateks ni 054 odm.maOsy/l ehS aols essol 1000 Lm mfro etw,as sefe,c .c.et ehT Olosmm asbilvrae rea TNO taelrde ot teh 0010 Lm. tI si onggi to akte 1 ilert to etcernotcna hatt 504 mOomsl nu,ier adn she olsa soels a epatsare lteundera 1 eilrt. reTtoge,h the uiinmmm tuonma of 2OH eeddne is gogni ot be 2 rsl.eti +



 +1  upvote downvote
submitted by trazobone(97)
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hTis si ym docnes etim gonid iths estnioqu YT DCIV.O The ieotnfnidi fo an sOm is the mnrbeu of melsoso of otlsue per elrit fo eotn.slv heT emts sltel ouy the hitgshe she acn ectneacortn rhe urine si 405 /skmmlOgo O,2H nad she ksate ni 054 /O.dlmaymos heS aosl osesl 0010 mL romf tae,sw s,efec .tce. ehT lsmOom asvbairel ear TNO rtdleae ot teh 1000 .mL tI is ioggn to ekat 1 ertil ot ecncetoarnt htat 054 Omoslm r,euin and seh oasl sseol a retaesap nedreltau 1 lt.rei ,thoegTre the nmimmui tamnuo fo 2OH dndeee si gongi ot eb 2 .silret

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