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题目内容
Both train A and train B provide 24-hour service throughout the day. Train A passes by a certain station every 12 minutes, while Train B passes by the same station every 20 minutes. For how many times can these two trains pass by the station at the same time from 06:00AM to 10:30AM in the same day?

Indicate all such values.

What is the value of x+y?

Quantity A

The average of all the interior angles inside a quadrilateral

Quantity B

The average of all the interior angles inside a pentagon
As$$\frac{5}{3} \times \frac{6}{4} \times \frac{7}{5} \times ... \times \frac{x}{y}$$ =20, the numerator of the latter fraction is 1 more than the numerator of the former fraction, and the denominator of the latter fraction is 1 more than the denominator of the former fraction, what is the value of x+y?
x,y and z are three integers between -10 and 10,inclusive. What is the least possible value of $$\frac{x-y}{z}$$?
xy≠0,x > y

Quantity A:1/x

Quantity B:1/y
100 < a < b < 1000

Quantity A

$$\frac{1}{a} - \frac{1}{b} $$

Quantity B

$$\frac{1}{100} - \frac{1}{1000} $$
If $$a$$, $$b$$ and $$c$$ are integers greater than $$-10$$ and less than $$10$$, and if $$c \neq 0$$, what is the least possible value of $$\frac{a-b}{c}$$？
If 0 < x ≤ 1, which of the following must be true?
If $$\frac{p}{t}$$ =8,and $$\frac{t}{8}=\frac{r}{2}$$,then what is the value of p/r?
$$\frac{4}{7}=\frac{4+s}{7+t}$$

Quantity A

s

Quantity B

$$\frac{4t}{7}$$
$$\frac{a}{c}$$=0.0075 and $$\frac{b}{c}$$=0.09,where a,b and c are positive integers. What is the least possible value of c?
If bottle A is filled with water, and then pour $$\frac{1}{2}$$ of the water into bottle B which was empty before. And then pour 1/4 of the water in bottle B into bottle A. At last, what fraction of bottle A is water?

Give your answer as a fraction.
The ratio of male to all is 4:9, and there are 80 males, how many females are there?
Mary raises a herd of cows and feeds a total of m kilograms of feed a week. She feeds a cow a day with n kilograms of feed. How many cows does Mary have?
The ratio of the number of apples to pears is 2: 3. Now the number of apples is increased by 2. How many pears should be added so that the ratio is still 2: 3?
There are some balls, the ratio of the number of green to red is 2:3, the ratio of red to blue is 3:5. If there are S blue balls, what is the number of green balls?
N students ate 3 different flavored pizzas with the same size. Two pizzas were equally distributed to n students. Since three students did not like the flavor of the third pizza, they did not ate it ,and the third pizza was equally distributed to the other students. If one student ate pizzas of all three kinds of flavors, then what fraction of all the 3 pizzas is the pizzas he ate?
The gross profit of some cars equals the total sales price minus the total tax. If the gross profit of n cars is q dollars, and the unit price of a car is s. what is the total tax?
Students are selected from two schools. In school A, the selection method is choosing one from every four students, and in school B, the selection method is choosing one from every six students. The number of students selected from school A is twice that of school B, what is the ratio of the number of students in school A to the number of students in school B?

Give your answer as a fraction

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