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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 otesiqnu si kgsnai uyo ohw cmuh trewa must eht aonwm keat in to niimtana eht aems isolma.ltyo hTsi ownma stake ni 054 mmsO fo oetslu rep ya.d iTsh si a iutn fo menmeetausr -- kinht of it ekil rg.mas

For hre to peke eth asem mslyooiatl seh tums xtcreee 045 mOms pre d.ya eTh ynol ywa rfo her ot xetrcee eth utlose is vai the dikey.ns hTe nloy yaw for ehr kesdiny ot xtceeer 054 Omms si fi teyh receetx 1 ietlr of treaw loas. hisT is the xam ccoteontnrian htta rhe kdseyin cna drceup.o eH(r nydeisk ear nto wu“eflrpo egnhou” ot emak erh nruie ayn reom enarcndtetoc htan ht.a)t

hisT nawmo si aosl ionlsg teahron rtiel fo aewtr to f,cese nstgweai dan snrpetiirao. shiT si eht l“ibsenisne wreta o.sl”s Ttha smena fi she gnlosi 1 telri fo raewt ot a,swet rpaoriitens and cesef epr dya splu 1 erlti fo etraw to urien (bescaue seh dnees to idoeslvs rhe ueslot ni ,o!tineghs)m fro erh bodol to syat hte same lotlsao,miy seh tmus raeecpl hte tawer hes olst hstu ,smtu ta nmimimu, dnrki 2 lriest of rtwea pre yd.a

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jean_young2019  rgaet pnta!nnaoxlaTekhi u!oy +
unknown001  itsh is yaw iaseer dna .shnoepcmeirelb ip t; rdea sfalh reasovyg rs,tfi dan hnte rubsh tghhuor tlano.uespc +



 +23  upvote downvote
submitted by cantaloupe5(87)
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hSes’ innigakt 540 Omsm rpe dya so esh snede ot xeeecrt 450 msOm rep ady to ninaaimt qliuierim.ub You ncat’ sjut treexce mmssO’ by mseeeshlvt -- tyeh eavh ot eb vlosisdde ni meso uatmon fo earwt.

se’tL yas yuo exetrec 450 Osmm tiwh 050 mL of trawe -- that mensa oruy yskdien era cnnregicnttao reuni :ot

450 mOms ÷ 050 Lm = 090 smO/Lm

Btu het mxmauim isht ’ldyas sidkeyn acn ncttneoreca iurne to is 045 m/L,mOs os ehs hsa to etrcxee eorm terwa ot get ti ttha i.duelt tTah tanumo of trewa is 1 L, ebuaces 504 /Omm1s L = 504 /LOmms.

woN set’rhe hnnogti pogsntip reh mfor cxeergtni hte 405 sOsmm in an vene orem tiuedl irune -- ofr eexpmal fi seh rankd na txear L of ewtra eno a,yd hte idnysek dculo gte rid of atth eaxrt L iwht teh maes mtunao of 054 Omsm yb duinglti hte eirun to 045 smmO ÷ 2 L = 252 /msOmL. utB the tunqoeis assk rof eth mimimnu unotam fo rteaw -- ihhcw si 1 L by eht dnykies (+ 1 L frmo eth hrteo fftsu rfo a altot of 2 )L.

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shieldmaiden  hnkTa Gdo ouy eaixnlpde wrhee atth iertl cema romf asecebu losrvaeghFy stju ootk it tou a magci aht and I was leoplemytc ostl +
skonys  lWduo be rtsea be dleuindc ni eth lneeIibssn eartW lso?s +3
skonys  my* (:. +
ankigravity  So, as aohetrn palmexe, fi seh ktoo in 900 y/sdmoamOl of etu,slo ehs lwoud ndee to aetrniu 2 L ot celar atht + 1 L mrof hte horet fftsu ofr a tltao of 3 ?L +



 +15  upvote downvote
submitted by burningmoon(18)
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W1t()ear 1Kg Lreat=w1 ra5O/em4gw 0kmts L/=5ea0msrO4twm Mtaeri nw O2H nedeed ot vsldeois 504 etsuol yb yeknid si L1 e()r 2eWawttra rhteO sefce( et 1tlT)L:lo.a= a (a1r+)tew r=L2a)(2etw

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ali_hassan  tsih is what i eneded +



 +10  upvote downvote
submitted by yotsubato(1208)
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Tihs eiuqtson is iup.dst aeWtr niatek rfo a thhleay laiiuvddni is 02. L a y.ad

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 +7  upvote downvote
submitted by madeforupvoting2(16)
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oT aimaitnn alpmsa ootmylilas tg&-; deeN to xlcayte pralcee lal eth dfilus tslo in hte yad

Seh tcanno tneotceanrc urien beova 504 gm/Osmk , so eht mnmimiu omanut fo arwte eerqruid ot be ceexrtde yb kediyns is 1 (ot xtecree eht 450 Omsm hse salmaetucuc rep )ad.y eTh minmmui eeiorxcnt aetrw qeerudri si celresynisa at mxa ;otrcotneaninc if yuo eerw to asy uoredcp irtdelu ruen,i say gskmO/5,22m sith lowdu uireqer 2 L fo wte.ar The untiqsoe snawt teh mimmuin lepobssi wtaer l,umevo os ew saeusm ’sehs tgcenctnaroni to eth .xma

1 L losses from kiedny + 900 Lm esibninsel + 010 Lm ni wetsa nad sfcee = 2L lsssoe &t;g- edne ot gsntie 2 L fo twrae to rep.lcae

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jesusisking  oS hfe,ullp kthna !yuo +



 +1  upvote downvote
submitted by misrao(5)
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Can enoesmo lxnepai teh naolrrceoit eetwnbe 054 lmaodOmy/s dna inngdee ot xreecet 1 L fo twr?ea kshanT

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trazobone  hiTs si ym odcsne time dgnoi sith nsotuqie YT CDOI.V hTe detionfiin fo na Oms si the uenrmb fo olemsso of teousl erp iertl of es.ontlv The tmse llste you hte sethgih she nca caoententcr hre inrue si 045 om/lgkmsO H2O, nad esh aekst ni 045 O.do/amylms She salo olses 0100 mL fomr ,wtsae sefec, c.t.e The Ooslmm lvrabeisa ear TON eadelrt ot hte 1000 Lm. It si gnoig to take 1 tirel to aeectnrotcn atht 054 sOmolm ienru, and hse laos leoss a sptreaea utdnreela 1 e.itrl ghee,Totr eth iinmmmu mntaou of O2H eeendd is gniog ot eb 2 .siretl +



 +1  upvote downvote
submitted by trazobone(97)
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isTh is ym sdeonc meit iognd siht stinoque TY CO.DVI ehT ftnndioiei of na smO is eht rumnbe of soolmes fo eltsuo erp rltie fo nvs.olet The smet lsetl yuo the hiethsg esh acn ectortnncae her nireu si 054 slgmOkom/ HO,2 nda hse saket in 045 slmo/ayd.Om Seh oals eslos 0010 mL mrfo tewas, eefcs, t..ec Teh omslOm aabelrisv are TON deelrat to teh 0100 .Lm It is igong ot keta 1 reilt to oetcrtcnaen ahtt 504 lmmosO ,erniu nad she losa sesol a tepseaar tednraelu 1 ert.il htorT,gee teh nmuimim taomnu of 2OH eeddne si nggio to be 2 leirt.s

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