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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 otnuiesq si gskian uyo owh hucm rwaet usmt het amonw keta ni to anaiintm hte smae tlal.oyosim This maown ateks ni 504 smOm fo setoul rep .day sThi si a intu fo mnraeemeuts -- khnti of it iekl grma.s

Fro erh ot ekpe teh sema mtaoslloiy ehs utms xerceet 054 Omms rep a.dy heT lnyo wya rfo reh ot erceext teh otules is via hte ikdn.sye hTe noyl ywa rfo her kysined ot ceerext 405 mOsm si if ehyt cerxete 1 tielr fo eartw .aols iTsh si het xam oricntetcnnao htat reh eydsnki anc decpr.ou (eHr esyndki aer tno lorpfe“uw huno”ge ot keam rhe urnie yan mroe tcrnctoeeand hnat h.a)tt

Tsih aownm is alos ignlso onhrate tlrei fo raewt to ,eescf ngaisetw nad i.apeotrnrsi Tsih is eth inebisls“ne ewart s.”slo htaT nsmea fi esh gonils 1 etril fo atwer ot a,stew eirtaiprnos dna fcees erp day ulsp 1 itlre fo wtrae to riune se(bacue hse endse to dvsisole rhe soeltu ni gmtns,!oi)he fro reh oobld to ysat het aems ,omyoslalti esh tusm laperce eht eawtr hse otsl uhts utms, ta iu,nmmmi drkin 2 itlesr of taewr per .yad

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jean_young2019  geatr katinahnapoT!xlen !uyo +
unknown001  stih is ayw ersiea nda merhonebsleci.p ;pti arde alsfh agyroevs sfirt, nda ehtn buhsr gthruoh .plonsaetuc +


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 +23  upvote downvote
submitted by cantaloupe5(87)
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Shes’ igikannt 045 smOm erp ayd so she edesn ot rexetec 540 mOms rep dya ot aatinimn iubueliqim.r ouY acn’t ustj erectxe smm’sO by slemtvshee -- yhte ehva ot be ssieddvlo ni mose uoanmt fo waret.

ste’L asy yuo ceterxe 540 smmO iwth 050 Lm of rtawe -- htta nseam oryu iskdyen are ctrngaoitnecn rneiu :ot

045 msOm ÷ 050 Lm = 090 mL/mOs

Btu het mamxium hist ys’lad ndiskye acn cetaeocntrn rieun to is 405 LOm,/sm os seh has to teexcre ermo etwar ot etg it tath uiteld. htaT touamn fo twaer si 1 L, beaceus 054 m/sO1m L = 504 sO.L/mm

Now ’shetre ghninot ntpsgpoi hre rmfo exretgicn eth 450 Omssm ni an even emor tliued inuer -- for lmeaxpe if esh dnkra na eatxr L fo awert eno ,yda eth kyesndi oculd egt rdi of atht tarxe L itwh teh saem tuamon fo 045 smOm by lgudniti hte ernui to 504 msOm ÷ 2 L = 225 /mmsLO. utB hte sqtinueo kass orf the imunimm atonum of awret -- cwihh si 1 L yb teh sdnkyie +( 1 L ormf teh erhot usftf ofr a taolt fo 2 .L)

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shieldmaiden  nakTh odG oyu exinedlap erewh that lrite mcea frmo acbesue hFglsearyov jtsu otok ti out a imcga tah nad I saw plleoymtce tols +
skonys  odWlu be earts eb icnleddu in the eisensnlbI eWrat ?lsos +3
skonys  m*y (:. +
ankigravity  o,S as hotarne lpexame, fi ehs ootk ni 090 omal/dmsyO of lsut,eo seh odwul eend to ruinaet 2 L to eaclr tath + 1 L rfmo the rhteo ffstu fro a ttoal of 3 L? +


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 +15  upvote downvote
submitted by burningmoon(18)
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1(W)aret Kg1 1twLra=e mOars w4/g0t5kem tsO4m/Lm0re=5aw a Mwitner O2H ededen ot vsldseio 405 teluso by dyiken si L1 a2aeretWr w(t) hOert efsce( te )aa=tlLl:1. To +)te(aw1r (teL)w2a=r2

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ali_hassan  iths si tahw i deeend +


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 +10  upvote downvote
submitted by yotsubato(1208)
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shiT tuionsqe si spi.udt tWear atnike for a hltaehy lidnvdaiiu si 20. L a .ady

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 +7  upvote downvote
submitted by madeforupvoting2(16)
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To tmnaiain sapmal motolyasil ;&g-t edNe to clxyaet paeercl lla teh isdulf otsl ni het yda

heS ctoann tocentcnaer urien oevba 504 gmk/msO , so the umminim antomu of erwta reeuidqr ot eb ceredxte yb ksenydi si 1 o(t etcrexe hte 504 mmsO hes emsucuclata erp ay).d heT mmimuin cetenoxir terwa dqierure is eeiayscsnrl ta amx nnacteotoicn;r fi uyo rwee ot sya cprodeu leudirt ne,uri sya m5k2,2sO/mg htis doluw erruqie 2 L fo artew. hTe nusetioq ntasw teh uinmimm sliboeps rtawe oelvum, os we sumsae ss’he icctongnrenta to eth .amx

1 L sslsoe rofm deiynk + 009 Lm nesilbisen + 010 Lm ni stewa adn eefcs = L2 ssselo gt&-; dene ot tgneis 2 L of wreat to e.crpeal

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jesusisking  So heu,llfp htakn y!uo +


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 +1  upvote downvote
submitted by misrao(5)
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nCa eeoosmn ipanxle eht norlicrteoa wbnteee 054 osal/Omdmy and idneneg to cteerex 1 L fo wt?are sahnkT

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trazobone  sThi is my dosenc temi igond htis eqioutsn YT ODIV.C eTh eitfinoind fo an mOs si eth uenrmb of lososem fo eltuos epr erilt of .lnoesvt ehT mste ellst yuo the tghiesh hes anc ercenaotnct reh niuer is 045 oOkmgm/sl OH2, and hse steka in 540 yaslo.m/mOd hSe oals oelss 0100 mL fmro a,setw ese,cf t.c.e hTe lmOsom aebarvlsi are ONT daerlte ot eht 0001 m.L It si ignog to ekat 1 rteli ot toenatcncer atht 540 olmOsm inure, and seh lsao leoss a eapserta udeanltre 1 iltre. e,otreTgh eht nmummii mnouat of HO2 deened is igngo ot eb 2 .iseltr +


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 +1  upvote downvote
submitted by trazobone(97)
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Tihs si ym oscdne tmie dgnoi shit tsnoqiue YT DVCIO. The iinnetiodf of na smO si hte enbrum fo soslmoe of uelost epr tiler fo ones.vlt Teh etsm tllse you hte geithhs ehs can eenctaontrc her erniu si 450 mOos/mglk 2H,O nad esh eakst in 450 a/dylomOsm. She alos eloss 0100 Lm mfor ,awets cseef, t.ec. The lsmomO rvliseaab ear TNO elatder to teh 0100 m.L tI is ggino to ekta 1 iletr ot tcaneroncte hatt 540 smoOlm reui,n and seh aslo oelss a rtseaepa enduatrle 1 eitrl. heetT,gro teh umimnim otmaun fo HO2 ednede si igong ot eb 2 .srietl

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