找到你今天要练的题。

For a certain rectangle, the ratio of the width to the length is 1 to 2. If the width of the rectangle is 69 centimeters, what is the length, in centimeters, of the rectangle?

Before liftoff, one of a space shuttle’s solid rocket boosters contained 496,000 kilograms (kg) of propellant. Exactly 22 seconds after liftoff, 386,066 kg of this propellant remained. On average, approximately how much propellant, in kg, did this solid rocket booster burn each second after liftoff?

The ratio of the number of preschoolers to the number of teachers at a preschool is 8 to 1. If this ratio is maintained and the number of preschoolers increases by 32, how will the number of teachers change?

For any circle, the ratio of its diameter to its circumference is 1 to π. If the diameter of circle B is 14 times the diameter of circle A, how does the circumference of circle B relate to the circumference of circle A?

The area of a rectangular region is increasing at a rate of 80 square feet per hour. Which of the following is closest to this rate in square meters per minute? (Use 1 meter = 3.28 feet.)

A figure has an area of 3,168 square inches. What is the area, in square feet, of this figure? (1 foot = 12 inches)

A giant armadillo has a mass of 39 kilograms. What is the giant armadillo's mass in grams? 
(1 kilogram = 1,000 grams)

A certain town has an area of 4.36 square miles. What is the area, in square yards, of this town? 
(1 mile = 1,760 yards)

In a scale model of an office building, a length of 1 inch is equivalent to a length of \( \frac{17}{3} \) feet in the actual office building. If a length in the actual office building measures x feet, which expression represents the corresponding length, in inches, in the model in terms of x?

An object travels at a constant speed of 12 centimeters per second.At this speed, what is the time, in seconds, that it would take for the object to travel 108 centimeters?

For a certain rectangular region, the ratio of its length to its width is 35 to 10.If the width of the rectangular region increases by 7 units, how must the length change to maintain this ratio?

What length, in centimeters, is equivalent to a length of 51 meters?
( 1 meter = 100 centimeters)