#### 题目列表

James can swim 750 yards in 10 minutes. If he swims at the same constant rate, how many minutes will it take him to swim 4.2 times this distance?_____
b is a multiple of positive integer a.

#### Quantity A

The ratio of a to b

#### Quantity B

$\frac{1}{2}$

Keri, Neill, and Rich use toilet paper in their apartment in a ratio of 3:2:2. Rich buys two cases of toilet paper online for everyones use at 28 rolls per case, an average of $3.50/roll and a$14 delivery charge. If they each contribute to the cost of the toilet paper in direct proportion to the amount they use, how much must Keri contribute?_____
36a = 25b,$ab \neq 0$

#### Quantity A

$\frac{5}{6}$

#### Quantity B

$\frac{a}{b}$

By volume, cranberry juice makes up 12.5 percent of Bees punch and 25 percent of Flos punch. If 3 liters of Bees punch are mixed with 6 liters of Flos punch, approximately what percent of the mixture, by volume, is cranberry juice?Indicate all such ratios.
At the beginning of the day, the ratio of cats to dogs at a boarding kennel was 10 to 11. Throughout the day, 4 dogs and 5 cats were admitted to the boarding kennel and no animals were released.

#### Quantity A

The number of cats in the boarding kennel at the end of the day

#### Quantity B

The number of dogs in the boarding kennel at the end of the day

If 7(a – 1) = 17(b – 1), and a and b are both positive integers the product of which is greater than 1, then what is the least possible sum of a and b?
A machine works at a constant rate and produces a bolts in 15 minutes and b bolts in c hours.

b

#### Quantity B

3ac

On a fishing trip, Robert caught salmon and halibut in a ratio of 4:5. If Robert caught 12 salmon, how many total fish did he catch?_____
If a high schools varsity tennis team is made up of 24 juniors and seniors, which of the following could be the ratio of juniors to seniors on the team?Indicate all such ratios.
Ann wants to make cookies, but she only has 2 eggs and the recipe calls for 3. If the recipe calls for 3 cups of flour, 1 cup of sugar, and $\frac{1}{2}$ cup of butter, how many cups of butter will she need to use?_____
For any Company X listed in the chart above, let ?X be defined as the difference between the mean annual donation of employees of Company X in the period 1980–1990 and that for the same company in the period 1980–2000. Which of the following is closest to the ratio of ?M to ?B?
If Company A had, on average, 15 times as many employees in the period 1980–2000 as did Company K, then which of the following is closest to the ratio of the actual donations from Company A in 1980–2000 to the actual donations from Company K in the same period?
A jar contains only marbles of three different colors: red, green, and yellow. The red and green marbles are in a ratio of 2:5, and the yellow and red marbles are in a ratio of 5:6. Which of the following could be the total number of marbles?
If the ratio of b to c is 15 to 4, and the ratio of a to c is 3 to 7, then what is the ratio of a to b?
Jenny`s factory produces gear shafts at the rate of 250 gear shafts per hour. She finds that she is short 3000 gear shafts on an order that must be completed in the next 10 hours. By what percent must Jenny increase her rate of production, in gear shafts per hour, in order to complete the order on time?_____
In one day, Juan sends Keith three times as many messages as he sends Laurence, and Laurence sends Missy 4.5 times as many messages as he receives from Juan. If Missy received 18 messages from Laurence, how many messages does Keith receive from Juan?
If the smallest angle of a triangle measures 45 degrees, which of the following could be the ratio of the three angles of the triangle?
If $\frac{a}{b}=\frac{11}{6}$ and $\frac{b}{c}=\frac{4}{3}$ , then what is the ratio of a to c ?_____
Mariko can knit 5 rows of a scarf in x minutes. If there are 100 rows in each foot of the scarf, how many hours, in terms of x and y, will it take Mariko to finish a scarf that is y feet long?

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