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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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heT iontsueq is kanisg ouy woh cumh tarwe must eht mnawo aket ni to imaintna eth seam a.otyomilsl hiTs nwoma taesk in 405 mmOs of etuslo erp day. shTi is a tinu fo ueenrmsmtea -- ntkih of ti eikl margs.

rFo erh ot peke eth same asitylmool seh sumt eecxtre 450 mmOs per ady. The yonl way ofr reh to ectrexe eth lusteo is vai the dn.ekyis hTe lnyo yaw orf ehr ysidenk to xerteec 504 Omsm si fi thye texrcee 1 elrti of aertw l.soa ishT si hte xma orncainneoctt ahtt her ikneysd acn rec.udpo Hr(e ienydsk ear not “ewuflorp uen”ogh to amek hre uerin yna eomr crcneeoatntd ahnt .)ttha

hsiT maown is loas nsiglo hortaen iletr of rwtea ot ,ecefs nwtiasge nda iein.otsaprr Tsih si het “lnsniesibe twear o.ls”s htTa aenms if she ilonsg 1 elitr fo artew to sae,wt inoasprriet nda sfece pre ady plus 1 rliet of waret to eiunr ees(ubac esh nesed to svdselio reh sutloe in igh,e)s!mtno rfo reh bldoo to ysat eht esma oayl,olmsit esh umst lpearce teh twrae she stol shtu u,stm at mmnmiiu, drink 2 esritl fo waetr rep d.ya

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jean_young2019  etrag aa!pxeninnlatoTkh uo!y +
unknown001  sthi si wya eaesir dan cbhslpnmoeeire. ; pti ared lfsha reoavgys f,stir nda enth uhsrb ghrotuh uoe.saclptn +



 +23  upvote downvote
submitted by cantaloupe5(87)
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h’Ses gnniakti 405 msmO epr dya os hes ndese ot ceeertx 450 smOm rep ayd to ainmiatn eui.mbliruqi Yuo cnta’ tusj cxeeret ’msOsm yb emtveshlse -- they avhe to eb dolviedss in esmo montau fo tawe.r

’teLs say ouy teercex 450 Omsm hitw 005 mL of artwe -- that names yuor sdyenik rae egnarninttocc rienu t:o

450 sOmm ÷ 005 Lm = 090 mO/Lms

tBu het muiaxmm ihts asdl’y sndekyi can arocenttnce uiner ot is 405 ,/msLmO os seh hsa ot eeetxrc rome waert ot egt ti ttha udt.lei That numato of rwtae si 1 L, bcseuea 504 /1mOms L = 045 m/OsLm.

owN te’hrse ntohngi pistonpg reh mrfo eigxretcn het 540 Ommss in na enve rmeo uelitd rnieu -- orf aelmpex if she kadrn an axetr L fo wtrae noe ,day teh sndyeki clduo egt dir fo hatt xreta L wiht eht sema otuman of 540 Omsm by tudngili eth urnie to 054 mOms ÷ 2 L = 225 sLm/Om. tuB teh itquoens ksas ofr eht uiimnmm mantou fo twera -- hhciw is 1 L by eth dykiesn +( 1 L fmro teh eothr ftsfu orf a olatt of 2 ).L

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shieldmaiden  haTkn oGd uoy epiexdaln eehwr that tleri ecam rofm uesceab vaglrhyesoF jtus ookt it otu a caigm tah and I swa teycmoellp tsol +
skonys  oWlud be aesrt eb nuddelci in het nsnilIbsee rtaeW ?sols +3
skonys  y*m :.( +
ankigravity  ,oS as nhaoret lm,xaepe if seh toko ni 900 slmOaod/my of uoest,l hes dwlou edne to etnirau 2 L to rclea tath + 1 L omrf hte hroet sffut rof a ttola fo 3 ?L +



 +15  upvote downvote
submitted by burningmoon(18)
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(areW1t) gK1 wtaL=re1 kg 0eawtrO/4mms5 =Lramtw0ems4O/5 wtrMaeni O2H ndedee ot sviolsed 054 otusel yb nekydi si 1L (rteW2 twraa)e trOeh sfc(ee te L aat:l)=T.1lo )re1+(taw (Lw22=a)ert

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ali_hassan  stih si awht i eddnee +



 +10  upvote downvote
submitted by yotsubato(1208)
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ihTs eunsioqt is .dtsiup erWta enakit orf a haethyl dnviiudila si .20 L a ady.

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 +7  upvote downvote
submitted by madeforupvoting2(16)
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oT mnantiia laamps osmlytoial ;-t&g deNe to xyeaclt ercalep lal the ifdusl ostl ni teh yda

eSh aotnnc cnroattneec rieun evoba 405 /smkOmg , so het uiminmm maunto fo rawte reridueq ot eb xtederec yb niekysd is 1 o(t extceer hte 540 mOms esh umclausetac pre .dya) Teh iummimn ercxoneti tarwe eerriudq si nscaryelies at xam rnoonaecc;titn if you erwe to ays ceoupdr elriutd ,nerui ays 2s/,m2Okg5m ihst dlwou ieeurqr 2 L fo terw.a The tqsenuio awsnt eht imimmun elpssibo arewt ovelm,u so we eumass e’hss notecgnrnicat ot the mxa.

1 L slsoes rfmo nekdiy + 009 Lm lnisnieebs + 010 mL ni taswe dna escef = 2L lsoess ;&t-g ende to itgens 2 L of werta to .arecelp

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jesusisking  oS flpel,uh tanhk uyo! +



 +1  upvote downvote
submitted by misrao(5)
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anC noseome xnapiel eht ctolonreira etweneb 540 y/Odomamsl dan negiend to creteex 1 L of ewt?ar Thsank

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trazobone  Tihs si my onsced time odign shti qistnoue TY .DOVCI heT eidiintfon of an msO is the unbrme of slmseoo fo lsueot erp leirt of s.vnteol eTh setm tesll oyu eth tshhegi seh nca artneoccnte hre einur is 504 gsom/Oklm O2,H dna hes eskat ni 054 oda.ymlmO/s hSe aslo seols 0100 mL romf ws,eat e,fsec .tec. hTe osmlmO bveasarli era OTN tleaedr ot eth 0001 mL. It is onigg to akte 1 etirl ot etratcoecnn atht 504 osOlmm ,nreui nad she sloa lsose a eesptara detuernal 1 i.ltre t,heeorTg the miinmmu umtano of 2OH enddee si gigno ot be 2 ret.lsi +



 +1  upvote downvote
submitted by trazobone(97)
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iTsh is my dncseo ietm iongd stih ntoqusei YT IO.VDC heT ndioitenfi fo na mOs si eht rbmune fo eoossml of otsleu rpe irlte fo loensv.t hTe mste elslt oyu het ehshtig she cna ntncterceoa erh irnue si 054 ogOsmk/lm OH,2 dna hse teaks ni 045 yamOslo/.md Seh losa loess 1000 Lm frmo s,waet ecsef, c..te The somlOm aearsvlbi are NOT eetrlda to teh 0100 mL. tI is ingog ot aekt 1 eitlr ot ceoeatrtcnn atht 504 lOosmm einr,u and hes aols eosls a rsaapeet udetrlnae 1 rli.te ot,grTehe teh muimnmi nmoaut of 2HO eednde si noigg to be 2 s.ritel

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