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PREP07 Test 1 On July 1 of last year, the total number of employees at Company E was decreased by 10 percent. Without any change in the salaries of the remaining employees, the average (arithmetic mean) employee salary was 10 percent more after the decrease in number of employees than before the decrease. The total of the combined salaries of all of the employees at Company E after July 1 last year was what percent of that before July 1 last year?
Magoosh $$If{{8-x}\over{x+1}} = x, then x^{2} + 2x - 3 =$$
Magoosh If x and y are positive integers, and 1 is the greatest common divisor of x and y, what is the greatest common divisor of 2x and 3y?
191031 There are 5 numbers，and the mean is known，mean-min=6，max-mean=7，waht is the range？
PREP07 Test 1 $$\frac{2^{(4-1)^{2}}}{2^{3-2}}=$$
PREP07 Test 2 The value of $$(-89)^\frac{1}{3}$$ is
OG12 If s is the product of the integers from 100 to 200, inclusive, and t is the product of the integers from 100 to 201, inclusive, what is $$\frac{1}{s}+\frac{1}{t}$$ in terms of t?
Of the 3,600 employees of Company X, $$\frac{1}{3}$$ are clerical. If the clerical staff were to be reduced by $$\frac{1}{3}$$, what percent of the total number of the remaining employees would then be clerical?
191031 There are now 1,000 students, whose average grade is 5 and the standard deviation is 1. So how many students have a grade greater than 4. （68% of the distribution lies within 1 standard deviation of the mean.）
OG17 OG18 Which of the following fractions is closest to $$\frac{1}{2}$$?
OG12 OG15 OG16 OG17 OG18 OG19 OG20 OG2022 Xavier, Yvonne, and Zelda each try independently to solve a problem. If their individual probabilities for success are $$\frac{1}{4}$$, $$\frac{1}{2}$$ and $$\frac{5}{8}$$ respectively, what is the probability that Xavier and Yvonne, but not Zelda, will solve the problem?
X, Y and Z each try independently to solve a problem. If their individual probabilities for success are $$\frac{1}{4}$$, $$\frac{1}{2}$$ and $$\frac{5}{8}$$, respectively, what is the probability that X and Y, but not Z, will solve the problem?
OG18-数学分册 At a certain pizzeria,$$\frac{1}{8}$$ of the pizzas sold in one week were mushroom and $$\frac{1}{3} $$ of the remaining pizzas sold were pepperoni. If n of the pizzas sold were pepperoni, how many were mushroom?
Ready4

How many integers that have a value less than satisfy the inequality ?
PREP07 Test 2 If 0 < m < 1, which of the following expressions has the least value?
191020 How many factors of 210 are both greater than 1 and odd numbers?
Ready4

If , which must be greater than 1?

I.

II.

III.

Ready4

If , which must be less than 1?

I.

II.

III.

181215 $$(\frac{1}{125})^{x}$$=$$625^{y}$$, $$\frac{x}{y}$$=?
OG15 OG16 OG17 OG18 OG19 OG20 OG2022 In the first week of the year, Nancy saved $1. In each of the next 51 weeks, she saved $1 more than she had saved in the previous week. What was the total amount that Nancy saved during the 52 weeks?