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题目内容
Yesterday, 40 percent of the employees who were at work at Company X left for the day before 5 P.M and 70 percent of the remaining employees left for the day before 6 P.M.

Quantity A

The percent of the employees at Company X yesterday who did not leave for the day before 6 P.M

Quantity B

20%
During a certain month, $$20$$ percent of all the electricity used by a household was used by the water heater. The cost per kilowatt-hour of the electricity used by the water heater was half the cost per kilowatt-hour of the rest of the electricity used. For that month, the cost of the electricity used by the water heater was what fraction of the cost of the electricity used by the household?


Quantity A

RS

Quantity B

TU


The center of the circle is O, and RS=ST=4. What is the length of arc RWT?
The list price of a belt and the list price of a scarf were each reduced by $5. The percent decrease in the list price of the belt was less than the percent decrease in the list price of the scarf.

Quantity A

The list price of the belt

Quantity B

The list price of the scarf
The cost to rent a motorbike from a rental shop is x dollars per hour for the first 3 hours and y dollars for each hour thereafter. Which of the following represents the total cost, in dollars, of renting a motorbike from this shop for an 8-hour period?
8x+24=56

Quantity A

2x+6

Quantity B

15

Quantity A

$$(4x)(3(-2x+1))$$

Quantity B

$$(4)(3x)(1-2x)$$
$$m^{2}n^{4}$$=$$\frac{1}{16}$$

Quantity A

$$n^{2}$$

Quantity B

4m
$$x-y \gt x$$ and $$x+y \lt y$$

Quantity A

$$x$$

Quantity B

$$y$$
x > 0, y < 0

Quantity A

x+y-1

Quantity B

x-y+1
0 < a < b < c < 1

x=$$\frac{\frac{a}{c}}{\frac{1}{b}}$$ and y=$$\frac{\frac{c}{b}}{a}$$

Quantity A

x

Quantity B

y
r > 0

Quantity A

The area of a circular region with radius $$r$$

Quantity B

The area of a circular region with radius $$r^{2}$$
x is a positive integer.

Quantity A

$$5^{-x}$$

Quantity B

1

Quantity A

The number of positive even integers less than 100, each of which is the square of an integer

Quantity B

The number of positive odd integers less than 100, each of which is the square of an integer
The retail price of each item in a certain store consists of the cost of the item, a profit that is 10 percent of the cost, and an overhead that is 30 percent of the cost. If an item in the store has a retail price of $21, what is the cost of the item?

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