Does anybody know how to do this?

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.

Write a corresponding real world problem to represent 2x - 125=400

Simplify the expression and find the missing terms. the simplest form of has in the numerator and in the denominator.