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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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heT uisnqoet is ikagsn uyo owh hcmu rawet tums teh onawm eakt in to iniaamnt hte asem .alylistoom hisT anmow tsaek ni 540 msmO of lteuso rpe da.y iThs si a nuit of etrasmnueem -- nkhit of ti eilk sg.amr

For reh to keep eth mesa moyslialot ehs must ertcxee 045 smmO rep ya.d Teh olny yaw orf ehr ot ectexre teh stelou si vai het ken.dysi The nyol way ofr ehr kndisye ot ecrxeet 054 mOms si fi yeht eeerxtc 1 rtiel fo weatr so.al isTh is eht amx nrtncoecotnia ahtt erh iskdeyn nca ecropd.u eHr( nysdike aer ton wl“reofup une”ogh ot meka erh rneui yna emro deatncontcre tanh h.att)

This mawno is also ilgons henaort lietr fo rtwae to fe,cse gaswneti dan eaistnorpri. iTsh is hte seisinnl“be weart l.o”ss ahtT sname fi hes slnoig 1 eirtl of ewart ot ,swtae natrsiierpo nad fseec rep dya puls 1 letri of trawe ot enuir esbea(cu ehs eensd to osisledv rhe sotuel in m,!)ethnsogi rof her odbol to asyt eth esma ,sayomtolli she sutm plecera het earwt seh tosl thsu mst,u at mm,nmiui rknid 2 esltir fo rawet erp da.y

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jean_young2019  rgtae annTotiea!xhalknp u!oy +
unknown001  hits is awy iaeser and reemsp.hlocebni i tp; raed flahs gsvoyrea rsift, adn nhet hrsub uhtorhg .petnaucsol +



 +23  upvote downvote
submitted by cantaloupe5(87)
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S’seh gktiinna 054 sOmm pre ayd os esh esned ot eectexr 540 mOsm per dya ot niatimna rqulei.umiib uYo a’ctn tjus ecrexet ms’msO by sesheemtlv -- they ahev ot be dvsesloid in msoe tuaonm fo ertaw.

stL’e yas ouy etercex 540 sOmm wtih 500 mL fo tearw -- that nesam uoyr nsiydke rae ttnicrnacogen nruie :to

045 mmsO ÷ 500 Lm = 090 mOs/Lm

Btu het mmxmaui hsti asyd’l kediysn nca cercennotta nuier ot si 405 /smm,OL so esh ash to cetrexe omre rtewa ot teg it ttah deuti.l Tath autnmo of wtrea si 1 L, usbceea 405 O1m/sm L = 405 sOLm.m/

owN ’stheer ignntoh osnppgit erh mfro nxieetcgr hte 045 ssmmO in an even emor uldtei uneir -- rfo axmleep fi seh radkn an reatx L of rtawe eno dy,a het sndykei cudol get dir of thta erxat L iwht het same uoanmt fo 054 Omms yb litgunid eht runei to 504 mmsO ÷ 2 L = 252 ms/OLm. tBu eht nuqsieot akss rof het nuimmim unmato fo wrtea -- whchi si 1 L yb eth kndyies (+ 1 L orfm the ehtor uftsf orf a tlota of 2 )L.

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shieldmaiden  akhTn Gdo you exaildpne ewhre htta eritl amce frmo seeabcu gevalsyhorF ujst okot ti tuo a igmca aht adn I was coeypletlm tlso +
skonys  Wodul be erast eb eldndcui ni teh snnlieesIb areWt sls?o +3
skonys  *my (.: +
ankigravity  S,o as naehtor xepale,m if esh ookt ni 090 laOsmdymo/ of teus,lo ehs udwol ende ot nirutae 2 L ot lecra ttha + 1 L ormf teh rheot fftsu fro a ottal of 3 ?L +



 +15  upvote downvote
submitted by burningmoon(18)
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1W()tare 1Kg r=ewta1L 5k/estg marm40Ow am4s/O0w5rmet=L rawMe tni O2H ededne ot losveids 054 ulseot by knyide is L1 etr wt)aWra(2e teOrh (efsec te =Ttlo 1aa)L:l. w)(ta1re+ 2a(2w)t=eLr

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ali_hassan  stih si wtah i denede +



 +10  upvote downvote
submitted by yotsubato(1208)
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ishT toenusiq is dups.it erWta anteki ofr a heahtly iaiildvdun is 2.0 L a yd.a

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 +7  upvote downvote
submitted by madeforupvoting2(16)
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To aaiitmnn apsaml ioatlmysol t-g;& eedN ot xcyltae peclaer lal hte dulsif tosl in eht ady

heS nconat tnrnccoatee ureni eaobv 405 /Ommkgs , so hte umnmimi mntaou fo ewrat uieerrdq to be dexeretc by ysnkdie si 1 (ot tcerxee hte 540 Omms ehs asatceucmlu rpe a)yd. eTh miiunmm ixctrneeo teawr iuereqrd is anescserlyi at max naonicettonrc; if you rwee to sya erpcduo uedtlir nire,u say 5,ms2gOk/2m tshi odwlu uierrqe 2 L of wert.a hTe oesuqitn swatn eth mumimni beloisps rtwae oeu,lmv os ew msueas ’essh cogairnnctetn ot het ma.x

1 L leosss rofm inykde + 900 Lm nsisiblnee + 100 Lm in tswea nda fcese = L2 sseslo ;t&g- dene to itsgne 2 L fo teraw to le.rcape

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jesusisking  oS pulf,lhe tknha u!yo +



 +1  upvote downvote
submitted by misrao(5)
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Cna osenmoe aiplnxe het irclnaooret enbetew 054 adymlms/oO dna egnnide ot rxeetce 1 L fo twra?e saThkn

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trazobone  sihT si ym socnde eitm dgion shti qoiunste TY IC.ODV eTh ndfoentiii fo na mOs si the benumr of omoslse of sleout rep tlire fo enlv.ost eTh esmt telsl you eht hghsiet seh nca tenrcceaont her eruni is 405 oO/lsmkgm O2,H dan seh kaste ni 450 saomm/l.ydO ehS aslo lsose 1000 mL omfr twe,sa feces, tc..e ehT smlOmo vialrbeas ear NTO trelade to het 1000 m.L tI si ggoin ot atek 1 lerti ot racetenonct ttha 054 lmosOm uei,rn adn seh olsa oessl a sateprea reueatndl 1 ei.tlr gToeth,er teh iummimn auntom of OH2 eeendd is oggni ot eb 2 esirl.t +



 +1  upvote downvote
submitted by trazobone(97)
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sThi si my ecsdon etmi gndoi hsit eosntqiu TY ODVC.I Teh tfeonidini fo na msO is hte nermbu fo oolmses of tsluoe pre itler of nstv.loe The etsm etlsl oyu hte hithesg hes nac ccnteatenor rhe reuin is 540 oslmkO/mg HO2, and she tseak in 540 smd/.yOloam She olas eslos 1000 mL mofr ,esatw fc,ees ct.e. The somOlm brlveaisa rea NOT aerdtle to eht 0100 mL. tI is gogin ot ekta 1 eitrl to etaonerccnt thta 504 oOmsml einu,r nda seh also seosl a terpaeas ueaetdrnl 1 eil.rt eeo,ghTrt hte iumnmim tmoaun fo H2O enedde si gnogi ot eb 2 stri.el

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