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190310 $$\frac{(n+9)!}{(n+10)!+(n+9)!} = \frac{1}{4!} n$$=?
KMFDS Is the standard deviation of the set of measurements $${x}_{1}$$, $${x}_{2}$$, $${x}_{3}$$, $${x}_{4}$$,....$${x}_{20}$$ less than 3 ?(1) The variance for the set of measurements is 4.(2) For each measurement, the difference between the mean and that measurement is 2.
Magoosh Bill took 4 math tests, and each test received a score out of 100. What was Bill's average (arithmetic mean) score for all 4 tests?(1) Bill's first 3 tests received an average score of 50.(2) Bill's last 2 tests received an average score of 50.
PREP07 Test 2 GMAT、gmat题库、gmat模考、gmat考满分The table shows the number of calls received by each of five operators during each of 4 one-hour periods. For which operator was the standard deviation of the numbers of calls received during these 4 periods the least?
PREP07 Test 2 A school purchased 2 computers whose prices were $1,000 and $2,000, respectively. The school is to purchase 2 more computers from a list of computers whose prices range from $1,000 to $2,000, inclusive. The greatest possible average (arithmetic mean) price of the 4 computers is how much greater than the least possible average price of the 4 computers?
OG19-数学分册 A school club plans to package and sell dried fruit to raise money. The club purchased 12 containers of dried fruit, each containing $$16\frac{3}{4}$$ pounds. What is the maximum number of individual bags of dried fruit, each containing $$\frac{1}{4}$$ pounds, that can be sold from the dried fruit the club purchased?
Ready4

If P is a real number and list S is defined as {-4, 4, 2, 2, P}, what is the value of x?

(1) x is the mean of list S

(2) x is the median of list S
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The people at a workshop are from the countries England, France, and Japan in the ratio , respectively. If  total people are at the workshop, how many more people are from England than from Japan?
190321 $$2^{x+y}*2^{-(x-y)}$$ = ?
1:x=2
2:y=4
Magoosh Three friends are buying a gift for a friend. Declan contributes 4 dollars more than$$\frac{1}{4}$$ the cost of the gift, Ed contributes 1 dollar less than $$\frac{1}{3}$$ the cost of the gift, and Frank contributes the remaining 22 dollars. What is the cost of the gift?
PREP07 Test 2 A fast-food company plans to build 4 new restaurants. If there are 12 sites that satisfy the company's criteria for location of new restaurants, in how many different ways can the company select the 4 sites needed for the new restaurants if the order of selection does not matter?
Ready4

Running at their respective constant rates, Machine M takes 4 days longer to produce x widgets than Machine N. At these rates, if the two machines together produce widgets in 2 days, how many days would it take Machine M alone to produce widgets?
OG12 OG15 OG16 OG17 OG18 OG19 OG20 OG2022 During a trip, Francine traveled x percent of the total distance at an average speed of 40 miles per hour and the rest of the distance at an average speed of 60 miles per hour. In terms of x, what was Francine's average speed for the entire trip?
OG12 OG15 OG16 An empty pool being filled with water at a constant rate takes 8 hours to fill to $$\frac{3}{5}$$ of its capacity. How much more time will it take to finish filling the pool?
OG12 The ratio of two quantities is 3 to 4. If each of the quantities is increased by 5, what is the ratio of these two new quantities?
Magoosh If the average (arithmetic mean) of a and b is j, and the average of c, d, and e is k, what is the average of a, b, c, d, e and j ?
300难题 The figure above shows the dimensions of a rectangular board that is to be cut into four identical pieces by making cuts at points A, B, and C,as indicated. If x = 45, what is the length AB ?(1 foot = 12 inches)
200301
There is a rectangle. The sum of the areas of which two parts is the same as the sum of the areas of part 2 and part 8?
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If {(12 + (a - 3)^{2})}^{\frac{1}{2}} = <font color='#FE8080'>4</font>, what is the value of a?
A model of London's Millennium Wheel in the cubicle of Manhattan Review's CEO has supports which are 4 centimeters apart, and a reinforcement bar of 2 centimeters in length. The length of each support is 8 centimeters. If a fly sits on top of the wheel, how high does it sit above the surface on which the supports rest?