GMAT考试数学辅导04年1月数学总结(四)
<p> 79.<span word="in">in</span> <span word="a">a</span> <span word="meeting">meeting</span> <span word="of">of</span> 3 <span word="representatives">representatives</span> <span word="from">from</span> <span word="each">each</span> <span word="of">of</span> 6 <span word="different">different</span> <span word="companies">companies</span>, <span word="each">each</span> <span word="person">person</span> <span word="shook">shook</span> <span word="hands">hands</span> <span word="with">with</span> <span word="every">every</span> <span word="person">person</span> <span word="not">not</span> <span word="from">from</span> <span word="his">his</span> <span word="or">or</span> <span word="her">her</span> <span word="own">own</span> <span word="company">company</span> . <span word="if">if</span> <span word="the">the</span> <span word="representatives">representatives</span> <span word="did">did</span> <span word="not">not</span> <span word="shake">shake</span> <span word="hands">hands</span> <span word="with">with</span> <span word="people">people</span> <span word="from">from</span> <span word="their">their</span> <span word="own">own</span> <span word="company">company</span>, <span word="how">how</span> <span word="many">many</span> <span word="handshakes">handshakes</span> <span word="take">take</span> <span word="place">place</span>?</p><p> <span word="ans">ans</span>:135</p><p> 80.<span word="from">from</span> <span word="a">a</span> <span word="group">group</span> <span word="of">of</span> 3 <span word="boys">boys</span> <span word="and">and</span> 3 <span word="girls">girls</span>, 4 <span word="children">children</span> <span word="are">are</span> <span word="to">to</span> <span word="be">be</span> <span word="randomly">randomly</span> <span word="selected">selected</span>. <span word="what">what</span> <span word="is">is</span> <span word="the">the</span> <span word="probability">probability</span> <span word="that">that</span> <span word="equal">equal</span> <span word="numbers">numbers</span> <span word="of">of</span> <span word="boys">boys</span> <span word="and">and</span> <span word="girls">girls</span> <span word="will">will</span> <span word="be">be</span> <span word="selected">selected</span>?</p><p> <span word="ans">ans</span>: 3/5</p><p> 81.<span word="the">the</span> <span word="first">first</span> <span word="roll">roll</span> <span word="of">of</span> <span word="a">a</span> <span word="cinema">cinema</span> <span word="has">has</span> 16 <span word="seats">seats</span>, <span word="the">the</span> <span word="roll">roll</span> <span word="immediately">immediately</span> <span word="after">after</span> <span word="the">the</span> <span word="first">first</span> <span word="roll">roll</span> <span word="has">has</span> 2 <span word="more">more</span> <span word="seats">seats</span> <span word="than">than</span> <span word="the">the</span> <span word="first">first</span> <span word="roll">roll</span>. <span word="every">every</span> <span word="roll">roll</span> <span word="has">has</span> <span word="two">two</span> <span word="more">more</span> <span word="seats">seats</span> <span word="than">than</span> <span word="the">the</span> <span word="roll">roll</span> <span word="immediately">immediately</span> <span word="in">in</span> <span word="front">front</span> <span word="of">of</span> <span word="it">it</span>. <span word="the">the</span> <span word="last">last</span> <span word="roll">roll</span> <span word="of">of</span> <span word="has">has</span> 64 <span word="seats">seats</span>. <span word="how">how</span> <span word="many">many</span> <span word="seats">seats</span> <span word="does">does</span> <span word="this">this</span> <span word="cinema">cinema</span> <span word="have">have</span>?</p><p> <span word="ans">ans</span>: 1000</p><p> 82.<span word="in">in</span> <span word="the">the</span> <span word="parallelogram">parallelogram</span> <span word="shown">shown</span>, <span word="pq">pq</span>=4, <span word="qr">qr</span>=6,<span word="angleqps">angleqps</span> <span word="is">is</span> 30 <span word="degree">degree</span>, <span word="what">what</span> <span word="is">is</span> <span word="the">the</span> <span word="area">area</span> <span word="of">of</span> <span word="pqrs">pqrs</span>?</p><p> <span word="q">q</span> ______________<span word="r">r</span></p><p> /<span word="l">l</span> /</p><p> / <span word="l">l</span> /</p><p> <span word="p">p</span> /__ <span word="l">l</span>__________/<span word="s">s</span></p><p> 83.<span word="a">a</span> <span word="scientist">scientist</span> <span word="recorded">recorded</span> <span word="the">the</span> <span word="number">number</span> <span word="of">of</span> <span word="eggs">eggs</span> <span word="in">in</span> <span word="each">each</span> <span word="of">of</span> <span word="the">the</span> 10 <span word="birds">birds</span> <span word="nests">nests</span>, <span word="what">what</span> <span word="was">was</span> <span word="the">the</span> <span word="standard">standard</span> <span word="devition">devition</span> <span word="of">of</span> <span word="the">the</span> <span word="numbers">numbers</span> <span word="of">of</span> <span word="eggs">eggs</span> <span word="in">in</span> <span word="the">the</span> 10 <span word="nests">nests</span>?</p><p> <span word="the">the</span> <span word="averge">averge</span> <span word="number">number</span> <span word="of">of</span> <span word="eggs">eggs</span> <span word="for">for</span> <span word="the">the</span> 10 <span word="nests">nests</span> <span word="was">was</span> 4</p><p> <span word="each">each</span> <span word="of">of</span> <span word="the">the</span> 10 <span word="nests">nests</span> <span word="contained">contained</span> <span word="the">the</span> <span word="same">same</span> <span word="number">number</span></p><p> <span word="ans">ans</span>: <span word="b">b</span></p><p> 84.<span word="the">the</span> <span word="base">base</span> <span word="of">of</span> <span word="a">a</span> <span word="retangular">retangular</span> <span word="solid">solid</span> <span word="tank">tank</span> <span word="is">is</span> <span word="a">a</span> <span word="square">square</span>, <span word="the">the</span> <span word="length">length</span> <span word="of">of</span> <span word="each">each</span> <span word="side">side</span> <span word="of">of</span> <span word="the">the</span> <span word="square">square</span> <span word="is">is</span> 4 <span word="meters">meters</span>, <span word="the">the</span> <span word="altitude">altitude</span> <span word="of">of</span> <span word="the">the</span> <span word="tank">tank</span> <span word="is">is</span> 6, <span word="if">if</span> <span word="there">there</span> <span word="is">is</span> 16 <span word="cube">cube</span> <span word="meters">meters</span> <span word="water">water</span> <span word="in">in</span> <span word="the">the</span> <span word="tank">tank</span>, <span word="what">what</span> <span word="is">is</span> <span word="the">the</span> <span word="rate">rate</span> <span word="of">of</span> <span word="the">the</span> <span word="volume">volume</span> <span word="of">of</span> <span word="water">water</span> <span word="in">in</span> <span word="the">the</span> <span word="tank">tank</span> <span word="to">to</span> <span word="the">the</span> <span word="volume">volume</span> <span word="of">of</span> <span word="the">the</span> <span word="retangular">retangular</span> <span word="solid">solid</span> <span word="tank">tank</span>?</p>
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