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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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hTe qeostuin si ngaiks oyu ohw hcmu rwate umst eth wmnao etak in to aiinmtan the same lol.yaiotms Tihs wmnoa tsaek ni 450 msOm of oulest epr da.y Tish is a niut of snmerteueam -- hktni fo it klei .armsg

oFr her ot epek eht esma syooailmtl ehs stum eecxrte 054 smOm per yad. Teh lony yaw orf erh ot tcexree het leotsu si via het nik.eyds hTe noly ayw for ehr kdiysne ot ertceex 045 mOms is fi htye eecxter 1 ilret fo tarew also. iThs is eht mxa oitccnnoaetrn ttha ehr diykens cna perdouc. rH(e ksiendy era not lefruopw“ nug”eho ot kaem her inreu yna omre crntcdneateo atnh .)that

ishT mnwoa is laso goisnl eanhrot elitr of eratw ot esefc, ngatwesi adn po.iitesarrn Thsi si hte esn“niibles twear o.”sls hatT asmen fi ehs lgosin 1 lerit fo arwet to tas,we irotapiresn dan esfce epr yda spul 1 tilre fo erawt ot reniu acees(ub seh esdne to eovilsds erh toulse in ognt!)ehim,s rfo her dlobo ot stay the amse losmiloay,t she smut ecperla the retaw seh tlos tuhs m,sut at immunm,i dikrn 2 etlirs fo rtwea erp y.ad

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jean_young2019  treag ataxnelpni!nThkao oyu! +
unknown001  thsi is wya sierae and eeesclbnmhp.ori ;pit ader sfalh goyrevsa sfir,t nad enht rhbus hhotgru l.tpaocunes +



 +23  upvote downvote
submitted by cantaloupe5(87)
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hesS’ aknniigt 405 Osmm per ayd so ehs dsnee to exertce 405 mOms erp yda ot ntnamiai qr.iimubiule uYo ctn’a sujt trecxee sOm’ms by eelsvmtseh -- tyeh veha to be vdlioesds ni some numaot fo .ewtar

’tLse yas uyo eertxce 540 sOmm htiw 005 Lm fo werat -- taht manse yruo ieksydn rea artntnongicec eruin :ot

405 Omsm ÷ 500 Lm = 900 sLmO/m

Btu hte mxammui htsi dyl’sa desikyn nac ranotntecec inreu ot is 045 Lm/O,ms so hes ahs ot ctrexee rome ratwe ot teg it ttah iult.ed hTta mtuona fo twera si 1 L, auesbce 045 m1/smO L = 450 O/Lms.m

owN eresh’t iotnhgn oitgsppn ehr morf ecienxrgt teh 054 msmOs ni an vene erom utdile uenir -- for leaempx fi esh kndar an trxea L fo aterw one ,yda eth skeiynd uodlc tge rid of ahtt xerta L htwi het emas unoamt of 450 mOms by gdinltui teh uiner ot 504 sOmm ÷ 2 L = 225 m/mOsL. tuB eth euiotnsq ssak for eth mnmmiui ountam of wreat -- hhiwc is 1 L yb the yndeski +( 1 L fmor eht rtohe tfsuf fro a tolta of 2 L).

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shieldmaiden  nakhT dGo you xelniadep eewrh ttha retil cmea fmor euscabe elrFgasohvy sjtu ktoo it out a maicg tha nad I wsa tllyepomec slto +
skonys  oWudl eb tsear be cdeidnlu ni teh esnebnsliI rWtea ssol? +3
skonys  my* :(. +
ankigravity  o,S as atenhro p,amxele if hes took in 009 Oymom/asld fo lusot,e hse lwdou nede to tirunae 2 L ot alrce ahtt + 1 L from teh rteho fufst rfo a altot of 3 ?L +



 +15  upvote downvote
submitted by burningmoon(18)
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Wrt()e1a 1Kg rw=atL1e Og4wr/em50a mtks Omw/emL=rt04as5 a entrwiM O2H eedend to dslevois 045 lesuot yb nediky si 1L (t2Wertwaae) r hOter (cfese te 1o:).aaltT=L l rw)t1+a(e ter2(2=aL)w

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ali_hassan  shit si awht i eneded +



 +10  upvote downvote
submitted by yotsubato(1208)
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This insqoute si .ptuids Wtear ikenat fro a ylhetha iilnudviad is 02. L a ayd.

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 +7  upvote downvote
submitted by madeforupvoting2(16)
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To amtiiann smapla yomoslltia g&-;t eNde ot ecatxly laeprec lla eth dlfusi slot ni hte dya

eSh nconta aernnecoctt uneir evaob 405 sOgmk/m , os eth miminmu nuoatm of etawr deiuqrer to eb etecderx yb nsedkyi is 1 t(o etcreex eht 405 msmO she atcmuslceau rpe dy)a. Teh mmminiu citronxee ewrta eeridqru is ncsilyesaer at mxa r;cnnacniootte if ouy wree to say odceurp ireltdu nu,rei say Ok,22mg/5sm sith udlow ruqeire 2 L of rwa.et ehT euntiqso snwta eht mnmimiu obsilesp artew l,mevou os we saesmu hess’ inrntaccongte ot eht xm.a

1 L ssosel frmo yieknd + 090 Lm bisienlnse + 100 mL ni awste adn cesef = 2L ssosel t&;-g dene to gsinet 2 L of taewr ot le.raecp

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jesusisking  So leu,flph nahtk uo!y +



 +1  upvote downvote
submitted by misrao(5)
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aCn ooensem nixplae eht tcaeonirrlo teeenwb 504 /ydaOoslmm dan ingedne to rxectee 1 L fo r?taew anhksT

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trazobone  siTh is my seondc miet oignd tihs suqeoitn TY IDVCO. The etioidfinn fo an msO si hte bmrenu of olmesos of eolsut per rteil of tsnv.elo hTe mset lelts uoy het isehhgt hes can etonecntacr ehr nriue is 405 /gmsOmlok OH,2 dan she ektas in 504 slyo/mOma.d eSh sola soles 0010 mL form ,wsaet c,eefs .c.te ehT mlsomO aasibrvel rae NTO ederatl ot teh 0001 m.L tI is gniog ot eakt 1 leirt to rtcetcneaon ttha 540 msomOl ,uienr and ehs saol eslos a setaaper undtlaere 1 teli.r Ttrheoge, eht umnimmi ntamou fo HO2 ededne si gigno ot be 2 lestr.i +



 +1  upvote downvote
submitted by trazobone(97)
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Tshi is my dcesno ietm gdnio this tqoesuni TY D.OVCI eTh ndfetniiio fo na sOm is het uenmrb fo loseoms of sleotu rep tiler of .venstlo ehT emst lltse yuo hte eigsthh hes cna ntonececatr rhe ineur is 054 lsmmgOo/k 2HO, and seh ktsea in 504 sl/moa.Omyd heS aslo oelss 0010 mL fomr aset,w c,fees e.tc. Teh mosOlm sbeaiavrl are TON dealetr ot eht 0001 L.m It is gingo to teka 1 erlti to etcoacetnnr ahtt 504 msoOlm in,ure dna hes loas seosl a teeaarsp nauleretd 1 etlri. teohT,ger eth mmiinmu tuamon fo 2OH nedeed si ignog to eb 2 i.lestr

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