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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 tneqisou si igsank ouy hwo hcmu aewtr muts eth mwano atke ni ot iniatnam teh mase yait.olmlos iTsh nmwao aktse ni 450 msOm of osltue epr .day sTih is a ntiu of ramumnetees -- nhtki of ti elki gsa.mr

oFr rhe to ekep eht ames tasoyolmil ehs tsmu eeerctx 054 mmOs epr d.ay hTe onyl wya orf reh to ecexetr the lseotu is vai eht ik.nseyd ehT nlyo awy orf ehr eysidkn ot xcrteee 054 msOm si if yeht eretxec 1 ietlr fo rwaet s.aol Tsih si het xam noencttcianor ahtt hre enksidy nac drpc.euo e(rH ydesikn rae otn wrepuof“l nh”egou ot ekma hre uneir nya remo ctaenrnodect ntha .th)ta

iTsh mnwao is lsoa gsionl hentrao lirte fo eatrw ot efc,se wsinteag dan treps.ioniar iThs si hte iebli“nessn trwea o.sl”s aTht smena if hse nogsil 1 lerti of arwet to esa,tw rritopisnea nda sefec rep dya pslu 1 lreit fo taewr to enrui e(ecusab esh sdnee to idssevlo erh tsuelo ni !e,mhoig)tns orf ehr odolb ot ytas eth maes s,miooallty ehs utsm relpaec teh atewr ehs tosl stuh tmu,s at ,uimmimn rkdin 2 ilrtse fo rtwae rpe .ady

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jean_young2019  taegr nnilnataoxkah!Tep !yuo +
unknown001  tsih is yaw sreeai nad ophe.ebsemlcinr p;ti raed shafl aevorgsy rfs,ti dan enht rhsub rhuhogt cteop.unasl +



 +23  upvote downvote
submitted by cantaloupe5(87)
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sS’eh igtniank 450 msmO erp ady os hse ensde to extcere 054 smmO rpe yda ot inntamai qmiiei.rlubu uYo n’tca just etxeecr s’sOmm yb slvhsteeme -- hyte heav to be selidovds in smoe umtano of .artew

tLe’s asy oyu etxecre 054 mmsO thwi 050 mL of teraw -- atth esnma rouy enkysid rae attirnccnegon irenu ot:

405 Omsm ÷ 050 Lm = 009 sLmmO/

Btu eth mimxuam sith ’yadls sdenkiy nca cteennotrca irune to is 450 LOm,ms/ os hes sha to eeretcx omer etwra to gte ti taht ilu.tde atTh montau of rtwae si 1 L, uasecbe 405 mOms/1 L = 450 .mmsLO/

woN te’sreh onignth spnoitgp her fmro ierexnctg eth 054 msOsm ni na vene more eidtul iernu -- rof apmlxee if seh dkran na atexr L of etrwa noe yda, het nyidsek ludco egt rdi of ahtt traex L iwth het esam mnauot fo 450 mOms yb nlitidgu hte nreiu to 504 sOmm ÷ 2 L = 252 s/LOmm. But teh oiqneust sksa ofr eth ummimni tnmuao fo ewtar -- chwih si 1 L by eth desynik (+ 1 L omfr eht etroh ftufs orf a oattl of 2 .L)

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shieldmaiden  kanhT oGd uyo pxnideeal eehrw taht etlir emca orfm acubese vehgsyolrFa stju koto ti otu a aimgc ath adn I wsa lopmecyelt otsl +
skonys  ulWod be ersat be ncieuddl ni hte nIlsneibes reWat ols?s +3
skonys  y*m (:. +
ankigravity  oS, as ethroan mpeea,lx fi she toko ni 090 omd/Osmaly fo ,oleuts she wulod ened ot enartiu 2 L ot alcre thta + 1 L omrf hte troeh fusft rfo a atolt of 3 L? +



 +15  upvote downvote
submitted by burningmoon(18)
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rW(a1)te 1gK rLtw=ae1 e40Osk tmar5mw/g /=eLa4wOsrt0m5m irwa tneM 2HO eenedd ot ssdevilo 054 elutso by ydneki si 1L W (2tr)wtearea eOhtr cs(eef et aaLl1o):=tT. l t(er+a1)w wrLeat(22)=

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ali_hassan  this is tawh i eedend +



 +10  upvote downvote
submitted by yotsubato(1208)
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hsiT enitoqus is dtpusi. Waret nkiaet ofr a alhethy iuvnlddiai si 20. L a .yad

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 +7  upvote downvote
submitted by madeforupvoting2(16)
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To aiintmna mpslaa ysoalotiml -t&;g eedN to alxeyct rcalepe lla eht fildus tlos in hte ayd

heS notnca actotcnreen nuire evboa 504 mgskmO/ , so het immnimu untoma fo treaw qeiderur ot be dceetrxe yb syndkei is 1 (to teecrex het 504 sOmm hes uctamaecslu rpe da.)y The nmmmuii cnieetoxr artwe reideruq si neracyiless ta amx co;tcntienroan if you weer ot yas pdurcoe teidurl ierun, ysa 2mOm5ks/g2, hist odlwu rqeueri 2 L fo arw.et Teh enuiotqs wsnat hte minmimu eioblpss aertw mvu,elo so we emuass sh’es rnigcntoaenct ot eth .axm

1 L ssselo ofrm iykend + 090 mL esblnisein + 100 mL in setwa nda efcse = L2 oeslss t;g-& edne ot sgitne 2 L fo rteaw ot a.eprlce

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jesusisking  So efhul,lp kahtn you! +



 +1  upvote downvote
submitted by misrao(5)
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Cna moesnoe nxaiple hte eloarotcrni enweetb 504 odlOaysm/m nda negined ot cxtreee 1 L fo wa?tre ahnsTk

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trazobone  isTh si ym ncosde meit noidg ihst qnseuito YT V.OIDC Teh oiniidfetn fo an sOm is eht umenbr fo eoolmss of olsteu pre eitrl fo nvt.eslo ehT tesm tesll you het hshtige seh nac tetnaecconr ehr erniu si 405 gkmlsoOm/ H,2O nad hse sketa ni 045 Oo.l/saymdm ehS olas soles 0100 Lm fmor ,westa ecesf, ce..t ehT soOmlm resvialba era NTO elrdaet to het 0100 Lm. It si gongi to etak 1 lietr to ccaenetntro hatt 045 Oolsmm uiren, and seh salo ossle a ateaeprs datueelrn 1 liret. ,Toehterg hte mminumi utonma of O2H eddnee is ngiog to eb 2 lei.trs +



 +1  upvote downvote
submitted by trazobone(97)
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hsiT is my desnco etim idnog siht qstuenio YT OCVD.I hTe eoinitifdn fo na Osm si the berumn fo omsloes fo tlesou rep rleti of lsnto.ev The etms slelt you hte hegihts she can ecnroctaten erh rnuie si 405 ogmsOklm/ O2H, dan hse askte ni 504 ayslm./dOom hSe lsoa ssloe 1000 Lm fmro es,twa eesf,c c.et. eTh smoOlm lreivabsa are OTN deaetrl to the 0001 L.m tI is ongig to ekat 1 tlrei to nceoatencrt htta 540 Omoslm eun,ri dna ehs soal losse a straapee alrtudnee 1 t.rlie erTotgeh, hte miniumm natomu fo OH2 ndeeed is oiggn to be 2 .esltir

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