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  1. ... the number of adults and children visiting the exhibition be a and c: 25a + 10c = 22000 ...(i) { a = 1000 - c ...(ii) Put (ii) into...

    分類:科學及數學 > 數學 2012年11月28日

  2. 1. 5(4-r)-2(3r+10)=22 20-5r-6r-20=22 -11r=22 r=-1/2 2. let the largest integer be x (x-2)+(x-1)+x=-21 3x-3=-21 3x=-18 x=-6 therefore, the largest integer is -6 3(a) let the weight of the rat be y kg 12y+0.3=14y-0.2 0.5=2y y=0.25 therefore,the weight of the rat is 0.25kg (b) 12*0.25+0.3 =3.3kg 4.(a) let the number...

    分類:科學及數學 > 數學 2011年11月02日

  3. 1) From the given, 1 kg should have a standard score of z = - 2.327 and hence the required mean is: 1 + 2.327 x 0.012 = 1.028 kg 2A) From the given, 20 mins has a standard score of z = - 0.52 For a single visitor, P(Stay time...

    分類:科學及數學 > 數學 2010年12月11日

  4. Let x adult tickets have sold , then 490 - x student tickets have sold .75x + 30(490 - x) = 30 45075x + 14700 - 30x = 30 45045x = 15750x = 350a)350 adult tickets sold and the amount received = 350 * 75 = $ 26 250.b)490 - 350 = 140 student tickets...

    分類:科學及數學 > 數學 2010年10月29日

  5. ...9 Hence, there is 9 $2 coin and 8 50cents coins. 2.in an exhibition , the prices of an adult ticket and a student ticket are$75 and $30 respectively. if on a day 490 tickets are sold altogether and the total income ...

    分類:科學及數學 > 數學 2010年10月15日