1.The rent of Mr Lee's house is increased from $8000 to $9000.Find the percentage increntage in rent.
2.John is now X years old and his mother is Y years older.Find their total age 5 years letter.
3.The perimeter of a rectangle is 48 cm.If the length is 14 cm,its area=
A.140cm2 B.144cm2 C.168cm2 D.196cm2 E.256cm2
4.(-5)+40-(-21)-18=
A.6 B.24 C.42 D.38 E.84
6.In the figure, the car is driving northward. What is the direction of the bus?
A.NW B.NE C.E D.SE E.W
數學題一問(1)
2007-08-05 8:15 am
回答 (3)
2007-08-05 8:34 am
✔ 最佳答案
1. Percentage increase = (9000 - 8000) / 8000 * 100% = 12.5%2. His mother is (X + Y) years old now. 5 years later, John is (X + 5) years old and his mother is (X + Y + 5) years old. Their total age will be (X + 5) + (X + Y + 5) = 2X + Y + 10
3. Let the width be w cm. From the property of a rectangle, 2 * (14 + w) = 48
14 + w = 24, w = 10. The width is 10cm. Therefore, the area is (14 * 10) cm^2 = 140cm^2. The answer is A
4. (-5) + 40 - (-21) - 18 = -5 + 40 + 21 - 18 = 38. The answer is D.
6. Where is the figure?
2007-08-05 9:14 am
1. ($9000-$8000) / $8000 * 100% = 12.5%
2. (X+5) + (Y+5) = X+Y+10
3. [(48-14*2) / 2 ] * 14 = 168cm2 (C)
4. (-5)+40-(-21)-18 = -5+40+21-18 = 38 (D)
6. no figure here, cannot answer
2. (X+5) + (Y+5) = X+Y+10
3. [(48-14*2) / 2 ] * 14 = 168cm2 (C)
4. (-5)+40-(-21)-18 = -5+40+21-18 = 38 (D)
6. no figure here, cannot answer
參考: =]
2007-08-05 8:38 am
1. ($9000-$8000) / $8000 * 100% = 12.5%
2. (X+5) + (Y+5) = X+Y+10
3. [(48-14*2) / 2 ] * 14 = 168cm2 (C)
4. (-5)+40-(-21)-18 = -5+40+21-18 = 38 (D)
6. no figure here, cannot answer
2007-08-05 00:40:38 補充：
2. (X 5) (X Y 5) = 2X Y 10頭先睇錯題目~~
2. (X+5) + (Y+5) = X+Y+10
3. [(48-14*2) / 2 ] * 14 = 168cm2 (C)
4. (-5)+40-(-21)-18 = -5+40+21-18 = 38 (D)
6. no figure here, cannot answer
2007-08-05 00:40:38 補充：
2. (X 5) (X Y 5) = 2X Y 10頭先睇錯題目~~
參考: myself
收錄日期: 2021-04-13 00:56:57
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