Answers to page 43 of mathematics ability training and test in Grade 6 of Zongyang primary school

Answers to page 43 of mathematics ability training and test in Grade 6 of Zongyang primary school

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Answers on page 8 of ability training and testing of Mathematics
First judge which quantity to regard as unit "1", then list the relation according to the meaning of fractional multiplication
(1) "The number of female students is one fourth of that of male students" is to regard () as a unit "1", and the relation is (& nbsp; & nbsp; & nbsp; & nbsp;)
(2) Five sixths of the number a is equal to the number B. it regards () as the unit "1" and the relation is (& nbsp; & nbsp; & nbsp; & nbsp; & nbsp;)
 
2. & nbsp; during the 2012 London Olympic Games, 360 primary school students in Grade 6 watched the competition, and the number of students in Grade 5 was five ninths of that in Grade 6. How many students in Grade 5 watched the competition?
 
3. There are 56 students in class 6 (2) of experimental primary school, and the number of myopia accounts for three eighths of the class. How many people are myopia?
 
4. In September 2011, the successful launch of China's "Tiangong-1" stimulated people's enthusiasm for exploring the universe. Please calculate the weight of mother on Mars? (picture 1) on earth: the weight is 48kg. (picture 2) on the moon: the weight is one sixth of that on the earth. (picture 3) on Mars: the weight is nine fourths of that on the moon
 
5. The canteen bought seven eighths of the flour and ate one fourth of it in the first week. The canteen ate another one eighth of it in the second week. How many tons did it take in two weeks?
 
6. The area of Taiwan Island in China is about 36000km, and that of Hainan Island is about 3000km more than 8 / 9 of Taiwan Island. How many square kilometers is the total area of the two islands?

(1) Number of male students * 1 / 4 = female students * 2 = number a * 5 / 6 = number B
360 * 5 / 9 = 200 (person)
56 * 3 / 8 = 21 (person)
48*1/6*4/9=1/18(kg)
7 / 8 * 1 / 4 = 7 / 32 (ton) & nbsp; & nbsp; 7 / 8-1 / 32-1 / 8 = 28 / 32-1 / 32-4 / 32 = 23 / 32 (ton)
36000+36000*8/9+3000=36000+32000+3000=75000(km²)

Grade 5 mathematics volume 1 Huanggang No.1 student page 48 questions 4,5
(4) The age of his father is 9 times that of XiaoCong, and that of his mother is 7.5 times that of XiaoCong. His father is 6 years older than his mother. How old is XiaoCong this year?
(5) It is known that car a is 15 kilometers slower than car B per hour. How many kilometers does car B travel per hour?

Let XiaoCong be x years old. 9x-7.5x = 61.5x = 6x = 6 ／ 1.5x = 4, so XiaoCong is 4 years old
Suppose B travels x kilometers per hour, then a Travels (X-15) kilometers per hour. 3.6 (x + X-15) = 486x = 75 A: B travels 75 kilometers per hour