What is four over twenty eight=x over thirty five

Which expression calculates the speed in meters per second of an object that travels a distance of 100 m every 20 seconds

The sixth grade art students are making a mosaic using tiles in the shape of right triangles.each tile has leg measures of 3 centimeters and 5 centimeters.i f there are 200 tiles in the mosaic what is the area of the mosaic.

What is the greater volume 72 quarts or 23 gallons