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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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ehT enusiqto is aikgsn uoy woh humc raetw muts the nwmoa aket ni ot imiatann teh same ilo.mlasoty hsiT monwa stkea ni 504 Omsm of tloseu erp .ady hTsi si a uitn of nmatemreues -- nitkh of ti ekil mgsa.r

rFo reh ot eekp eht ames alomltyosi she utsm rceeetx 540 Omsm epr ay.d heT lyno ayw ofr hre to reeecxt the tsouel si aiv teh ykineds. Teh noly ayw orf reh seyndki to eerextc 054 Omsm is if tyeh cexteer 1 irlet of wraet alos. iTsh si eth axm rnioncntceato ahtt hre iyedksn can udecp.or eHr( yksiend are nto ul“fweorp onh”ueg to keam hre euinr nya reom oncrtadtneec nhat tha.)t

Thsi mawon is olsa gsloin erohnta ilret of trwae to es,ecf egwnisat and nirrpaeo.ist sTih si teh enbsisle“ni trawe lso.”s taTh sname if seh sniolg 1 eitlr fo ewtra to wts,ea aespotnriri nda cesef pre dya upsl 1 ilret fo tarew ot nurei ecu(bsea ehs esnde to oivlssed erh lsotue in gni,t)e!mosh ofr hre oldbo ot tsya het seam symlo,altoi hes mtus erelcpa the earwt hse oslt hust tsmu, ta ium,nmmi nikdr 2 lstrei of eatwr per ya.d

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jean_young2019  egart nTk!petnanloiaahx o!yu +
unknown001  this si yaw rsaeei nda eebchrlnmoips.e pti; aedr ahslf gaoervys rfs,ti nad nteh hburs orghhtu esalptn.cou +



 +23  upvote downvote
submitted by cantaloupe5(87)
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hesS’ igaknitn 540 mmsO epr yda so ehs dsene to ecxrtee 045 Omms per day ot iatamnin l.ueiumibirq uoY a’tnc ujst tceeexr mss’Om yb hemesesvlt -- thye have ot eb osievdlds in mseo oanmtu of w.aert

e’sLt asy you eeetrcx 540 mmsO with 005 mL of werat -- atth namse ruoy ideknsy rae ntgactnrenico enriu to:

405 mmsO ÷ 050 mL = 009 /LOmms

uBt eth ammuxim isht dasyl’ edksiny nca tneanccroet nurie to si 450 ,/LmsmO so esh has ot xetecer mreo ratew ot tge ti hatt tiule.d htaT noumta fo rtaew is 1 L, ucaeebs 405 O1s/mm L = 450 Omsm/L.

woN ee’htsr nhtgion spgtopni ehr rfmo ceentirxg eth 045 Osmms in na nvee ermo uitedl ireun -- orf mpelaex if hes dnrka na eraxt L fo aertw eon y,ad hte kiydesn dolcu etg rdi fo tath etxra L tihw het mase ouantm fo 504 msmO by iunligdt teh nueri ot 054 sOmm ÷ 2 L = 522 smLO/m. tBu het nqsiteuo asks rfo teh uimmmni tauonm of wrtea -- cwhih si 1 L by het eydsikn (+ 1 L rfmo hte htreo ffuts rof a toalt of 2 L.)

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shieldmaiden  hkanT Gdo ouy endxepali erehw ahtt ielrt ecam omfr ueescab Felvyasgorh tusj koto it tuo a amgic ath nda I wsa cteepmllyo ostl +
skonys  olWdu eb stera eb ildcunde in the lneiInsebs aWert os?sl +3
skonys  ym* :(. +
ankigravity  oS, as etnoahr mep,lxea if she koot ni 090 mdsmOlo/ya of uot,les she wdluo need ot ianrute 2 L to ecalr that + 1 L omrf eth ohert uffts rof a total fo 3 ?L +



 +15  upvote downvote
submitted by burningmoon(18)
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1erta)(W Kg1 trLwea1= 45m rekag0smw/tO /s4teLma=m0wO5r ta eirnMw 2OH edened to ideovssl 045 usleot yb iyendk si L1 (etr )aWrawt2e erOth esc(fe et l.a)1aL:=toTl wra1(+te) r2Le2)ta=w(

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ali_hassan  ihts is tawh i edndee +



 +10  upvote downvote
submitted by yotsubato(1208)
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sThi uotqisne is ptids.u rWeta knetai ofr a hahtely iddvilnaiu si 2.0 L a .ayd

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 +7  upvote downvote
submitted by madeforupvoting2(16)
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To iaatmnin spmala lsoamiytol &-;gt Need ot axcetly crleaep lal teh dslfiu tslo in teh day

Seh noatcn ecartocnetn runei vaeob 405 sOkmm/g , so the mumimin utnoam of teawr eiqudrre to eb ertedexc by kyndeis si 1 ot( erectex teh 405 mOsm ehs esualacucmt erp d).ya hTe mniuimm cixnertoe atwre eredirqu is lcsrneaysei at xma orinnat;tcocne if yuo eerw ot sya durpeoc ldeuirt u,rien ays /g2m2Om,sk5 ihts ulwod requeir 2 L fo tae.rw heT intsequo atwns eht mmuimni sbleispo ewrat ,muovle os ew usesam hsse’ rctconagteinn to eth xa.m

1 L eslsos rmfo eniydk + 090 Lm sineielbsn + 001 Lm in setaw and fcsee = 2L lossse t&-g; nede ot ietgsn 2 L of erwat ot eprecla.

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jesusisking  oS ufll,hpe hntak !oyu +



 +1  upvote downvote
submitted by misrao(5)
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anC somnoee pnxlaei the rrtoiclonae wenbeet 405 dsyol/mmOa dan negiend ot xtreeec 1 L of etraw? nTaksh

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trazobone  sThi is ym dcnsoe eimt dgoin htsi stenuqio TY IV.DOC The tnenidfoii of na Osm si hte rebmun of sseomlo fo teousl erp lreit of evtol.ns heT etms setll oyu het eighsht hse nac rtcaenecont ehr uneir si 450 omkmO/slg 2,OH dan hse tkaes in 540 laO/.mdmyso Seh oasl eslso 1000 mL romf etaw,s cesef, tce.. Teh smoOml eavlbisra are NOT drteela ot the 0001 L.m It is onggi ot tkae 1 eirtl ot cenetotcnar htat 504 lommOs i,ernu dna hes slao ssloe a seataerp erledaunt 1 tlier. reeo,thgT hte nimmium anomut of H2O dendee is iggno to be 2 r.ilset +



 +1  upvote downvote
submitted by trazobone(97)
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siTh si ym doesnc mtei oidng hits oesunitq YT DI.OCV heT oniiednift fo na smO is the bnmeru fo sleomso fo uesotl pre rietl of tsevlon. ehT semt estll ouy the gihsthe hes anc etcncareont hre eniru si 405 m/omlskgO ,O2H dan seh skeat in 405 sao./dmOlmy ehS osla slseo 0010 mL ofmr tae,ws ,efsce .e.tc Teh mlOsom avblrisea rea TON ldteare to het 0001 Lm. tI si going to taek 1 itrle ot oaetreccntn taht 450 mmoslO ,nireu dna seh oasl slsoe a seprteaa luedtaner 1 t.eril roTe,thge the inummim tmauno fo OH2 edeend si igogn ot eb 2 tesr.li

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