9)Eric recorded the differences between the total scores of Blue House , Yellow House and Green House as compared with Red House on a sports day .
═════════════════════════════════════════════║
║　ｈｏｕｓｅ　　║ｂｌｕｅ　ｈｏｕｓｅ║ｙｅｌｌｏｗ　ｈｏｕｓｅ║ｇｒｅｅｎ　ｈｏｕｓｅ║
║════════════════════════════════════════════║
║difference between  ║       　　－１２　 　　║　　　　－４２　　　║　　　　＋１８　　　　║
║total             scores  ║　　　　　　　 　　　║　　　　　   　　　    ║ 　　　 　　　　　　　║
══════════════════════════════════════════════
(Note : +1  represent a score of 1 more than that of Red house .)
(a) Which House had the lowest score ?
(b) Which House would be the champion ?
(c) if Yellow House had a score of 195 . what was the champion ?


11 ) Ａ　　　　　　　Ｂ　　　 Ｃ                                    Ｄ     　　　　　　Ｅ
＜－－＊－－＊－－＊－－＊－－＊－－＊－－＊－－－－－－－－－－－－－－＊－－－－－－－－－－－＊－－－－－＞
　　－９　－８　－７　－６　－５　－４　－３　　　　　　　　　　　　　　
Ａ．Ｂ．Ｃ．Ｄ　and   Ｅ　are  five  points on the number line shown above .
(a) If   ＡＣ　＝　２ＣＤ　，what number does Ｄ  represent ?
(b) If   ＢＤ　＝　ＣＥ　　，what number does Ｅ  represent ? what is the opposite number of Ｅ.
14) A company had made a profit of $240000 in January . a loss of $180000 in February . a loss of $120000 in March and a profit of 80000 in each of the subsequent months .Find the overall profit (or loss ) of the company in the first half of the year .


15) There are two lifts ,A and B ,in a building . Sam enters lift A at the ground floor .Lift  A moves down 6 floor and then moves up 1
5 floors . Amy enters lift B 3 floors above the ground floor . Lift B moves up 3 floors and then moves down 5 floors .
(a) Which floors will Sam and Amy reach respectively ?
(b) Which lift is higher , and by how many floors ?


5) At a certain instant , an acroplane is located 3400 m above a ship sailing on sea and a submarine is located 200 m beneath the ship .(Directed Numbers or the number Line )
(a) By taking the altitude of the ship as 0 m . use directed numbers to represent the altitudes of the ceroplane and the submarine.
(b) By taking the altitude of the aeroplane as 0 m . what is the altitude of the submarine

9A yellow house
9B green house
9C 255marks    (195+42+18)

11題 你個number line 我睇唔明-_-

15A SAM: (-6)+15  =9
　　AMY:  3-5  = -2
15B LIFT A  ,   9-(-2) = 11


5A CEROPLANE:  +3400      SUBMARINE:   -200
5B SUBMARINE:   0-3400-200 = -3600

點解好似係仲難過f.2甘ge - ______ - '