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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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Teh etsuniqo is gaknis oyu owh hmuc wetra utsm het nawom teka ni ot aainimtn het aesm .mtlioslaoy iThs maonw kaste ni 450 Omms fo elstou per a.yd ihsT si a unit of tsmmrueenae -- htkin fo ti leki mag.sr

roF her ot keep the sema iomtsyoall hes utms teeexrc 045 mOsm per day. Teh lony wya ofr rhe ot exceert teh suoelt si via the kneiy.sd ehT nylo way for reh isykden to xreeect 450 Omsm si if eyht eterxce 1 irelt fo trewa oa.sl sThi is teh mxa nneocitctoanr ttah erh nkidesy can u.rcpedo r(eH ineysdk are not ep“ulfowr ”eohugn ot meak her ierun nay meor ncadteotcern hnta th)t.a

iTsh wmano si laso lgsion htanoer eltir fo treaw to e,sfec etswagin nad oiparstirn.e ihsT si het sinineb“sel watre l”.oss Thta msnea fi hse noglis 1 treil of ewrat to wtesa, toeairprins dan esecf per yda lusp 1 itler of wtaer ot runei b(caeseu ehs sende ot sivoelds ehr lsotue in n!igmso,teh) orf rhe boold ot atys eht smae lisot,lmoya she usmt lpreaec eht taerw hes ltso hsut mu,ts ta nimim,um nrdik 2 srelti fo erwat rep .day

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jean_young2019  arteg nailToxhnkep!aatn !uoy +
unknown001  sith is ywa iesear dan reseh.econilmpb pi ;t erad lsfah svgayeor tsir,f nda nhet ruhbs hohrgtu pao.neuclts +



 +23  upvote downvote
submitted by cantaloupe5(87)
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eh’Ss angikitn 405 mOms rpe day so seh dsene to terxece 054 Osmm rep dya to niatamni bilimrie.uuq oYu acnt’ sjtu retexce mmO’ss by smethleves -- ethy vhea ot eb divoledss ni osme unmoat of artwe.

sL’te ysa uoy eecxter 540 mOsm htwi 050 mL fo wetar -- taht maesn ouyr ksnydie rea ningctnceotar einur t:o

045 mOsm ÷ 005 Lm = 009 O/smmL

Btu eht mmmaiux isht aysd’l dkynsei can actenrtenoc iurne ot is 540 s/m,OmL so hes sah ot extreec oerm arewt to etg it ahtt ueldt.i hatT onmtau of wrtea is 1 L, cuesbae 045 m/1smO L = 405 Om./msL

oNw s’three inoghnt tgpnpsoi rhe mrof gxterenci the 405 mOmss ni na neve roem iletdu eiunr -- fro elpaexm fi hes adrkn na xaert L of waetr noe ayd, eth ekdsyni uolcd etg idr of htat arext L iwth the smae otunam of 045 mOms by gtidinlu hte ruien ot 054 smmO ÷ 2 L = 252 LO/mms. uBt teh steouiqn sska orf eth iuimmnm nmtoua fo etwar -- ichhw si 1 L by hte kdnseiy +( 1 L frmo the htore utsff orf a olatt of 2 ).L

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shieldmaiden  aTnhk odG uyo ldpeiaenx where atth rleti ecam form ueabsce hrFoelsaygv tusj otok it out a gimca hta and I aws leypotmlce tslo +
skonys  udWol be tesra be deniludc ni teh liIesennbs Warte sl?os +3
skonys  m*y .(: +
ankigravity  ,oS as hotnaer ae,pemlx if seh koto in 090 lomdmayO/s of ts,eoul hes owlud deen to atinreu 2 L to caerl ttha + 1 L morf het htroe uftsf for a tloat fo 3 ?L +



 +15  upvote downvote
submitted by burningmoon(18)
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1(aWer)t 1Kg te1awLr= mtms ga05ekr4/wO /e5rw0mtmLa4O=s Mwe tairn 2OH deneed to eovsldsi 405 toelsu yb ikedny si L1 w)ar reetWt2(a rhteO sce(fe te )laaTt1=ol:L. r)aw(1+et era)2(2wLt=

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ali_hassan  htis is hwta i edeedn +



 +10  upvote downvote
submitted by yotsubato(1208)
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sThi esquniot si .pitusd tarWe tenkia orf a yalethh iaiuvlnddi is .02 L a .dya

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 +7  upvote downvote
submitted by madeforupvoting2(16)
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oT miaiannt aalmps siamyltool &g;-t eeNd ot xyletac acprlee all teh sduifl stlo ni the dya

She tnocna ecenrtcotan reinu evbao 405 k/mOsgm , os eth mmmnuii uatnmo of rawte eurieqdr to be cxerdeet yb nsikdye si 1 (ot xcreeet hte 540 mmOs seh utlemcascua rpe ).yad The mniummi xnoietecr tewra rdueriqe si rnalecssiye ta max ntc;icnntoroea fi uyo rewe ot asy oedpcru relutid i,rneu asy g52/O,2mskm tish odlwu qurieer 2 L of rtaw.e The tisqnueo asntw teh uinmmmi esbolips arwet me,oluv os ew semaus ehs’s egtnrtannccoi to eht mxa.

1 L sloses mofr edikyn + 900 mL slisebinen + 010 mL in etwas and secfe = 2L sesols -&g;t ndee ot eigsnt 2 L fo wtrae to pacel.er

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jesusisking  So llfep,hu nkhat y!ou +



 +1  upvote downvote
submitted by misrao(5)
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Can oenmseo lainpxe hte nrioletocra twebnee 045 ym/asmloOd nad gednnie to ecextre 1 L of ?eartw hTkans

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trazobone  hsTi si my cdones emit inodg tshi untisqeo TY CIODV. eTh deotifniin fo na Osm si the eubrmn fo somseol fo tolseu rep eirtl of e.oltnsv hTe emst etlsl uoy eth htshige she nca terntocnaec rhe neuri is 540 soO/mgklm 2OH, nad hse atkes ni 504 dmayol/Oms. eSh soal selos 0010 mL rofm taesw, e,ecsf ..tce eTh Oslomm eibrsvlaa are TON teraled ot the 0010 m.L tI is gngio ot aket 1 triel ot nrtceantcoe ttha 405 smmloO ,ruein nad esh olas leoss a ereaastp duanletre 1 i.rlet reothTe,g het mmiinum tnoamu fo 2HO deeend is igngo to be 2 ir.tsle +



 +1  upvote downvote
submitted by trazobone(97)
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sTih si my dceson tmei gdnio htsi qtunsoei TY IOC.VD Teh edintofnii of na mOs si teh ruenbm fo sloemso fo lostue rep etirl fo ltvne.os eTh estm stlel you eht thhesgi seh can ctconetnrae hre rieun si 405 gk/lmmoOs ,2OH and seh teaks in 540 aO/s.domyml eSh olsa lseso 0100 mL ormf w,saet sc,fee c.e.t heT lommsO slbveaair ear NOT telared to hte 0100 .Lm It is iogng to aekt 1 itler to aetotncernc htta 045 olOmms ,euirn nda hes lsao sesol a rasateep rundleeta 1 rtl.ie eoTt,grhe the mumnimi anmuot of 2OH enedde si gigno to eb 2 er.ilts

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