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Ready4	If $O$ is the center of the circle above, what fraction of the circular region is shaded?
Ready4	If the numbers $\frac{2}{5}$ , $\frac{1}{2}$ , $\frac{1}{<font color='#FE8080'>4</font>}$ , $\frac{1}{3}$ , and $\frac{3}{10}$ were ordered from least to greatest, the middle number of the resulting sequence would be
Ready4	It would take one landscaper 45 minutes to mow a lawn and another landscaper 60 minutes to mow the same lawn. How many minutes would it take both landscapers, working simultaneously at their respective constant rates, to mow the lawn?
Ready4	It would take one painter 5 hours to paint the rooms in a house and another painter 4 hours to paint the same rooms. How many hours would it take both painters, working simultaneously at their respective constant rates, to paint the rooms?
Ready4	For the first portion of her trip, Frederique traveled $\frac{x}{8}$ of the total distance in miles at an average speed of 40 miles per hour, such that $1\leq x \leq 7$ . She traveled the remaining distance at an average speed of 60 miles per hour. In terms of $x$ , what was Frederique's average speed for the entire trip?
Ready4	A dollar amount of $5x$ was distributed evenly among three charitable organizations, A, B, and C. However, after it was determined that Organization C was ineligible for its share, its share was given to Organization B. Organization B chose to give Organization A the portion of Organization C's share that Organization A would have received if Organization C's share had been evenly split among four organizations including Organization A. What was the dollar amount, in terms of $x$ , that Organization A ultimately received?
Ready4	$\frac{1}{3}+\bigg[\bigg(\frac{10}{7}*\frac{7}{12}\bigg)\div6\bigg]-\frac{11}{12}=$
Ready4	In an organization, one tenth of the male staff members and one fourth of the female staff members are involved in sports. If the total number of male staff is half of the number of female staff, then what fraction of the total staff plays sports?
300难题	Ben and Ann are among 7 contestants from which 4 semifinalists are to be selected. Of the different possible selections, how many contain neither Ben nor Ann?
	Does the integer k have a factor p such that 1 < p < k?(1)k>4!(2)$$13! + 2 \le k \le 13! + 13$$
300难题	The "new scholarship" mentioned in the first paragraph suggests which of the following concerning the "promises" mentioned in lines 4–5?
Ready4	If arc PQR above is a semicircle, what is the length of diameter PR? (1) a = 4 (2) b = 1
Ready4	Two sides of a triangle have lengths 4 and 6. How many different integer values of the third side are possible?
Ready4	How many 5-digit multiples of 3 can be formed using only the digits 0, 1, 2, 3, 4, and 5, without repeating any digits?
第一期	The lengths of the three sides of isosceles triangle are t-6, t-4, and 2t-20. Which of the following may be the perimeter of the triangle?
181215	The lengths of the three sides of isosceles triangle are t-6, t-4, and 2t-20. Which of the following may be the perimeter of the triangle?
190603	Now we have to choose 4 teams from 6 teams to go to the game, then how many different selection methods are there?
181215	A={1,2,3,4,5}, B={1,2,3,4,5}. Take a number from sets A and B respectively. What is the probability that the product of these two numbers is less than 4?
181215	n=? 1: The greatest common factor for n and 12 is 4. 2: The least common multiple of n and 12 is 60.
190124	$$B_n$$=$$A_{n+1}$$-$$A_n$$,$$B_{n+1}$$-$$B_n$$=2.$$A_10$$=? 1:$$A_1$$=1,$$A_3$$=3 2:$$A_2$$=2,$$A_4$$=4