PLEASE HELP URGENT I PUT A PIC

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.

Look at arnold's attempt to solve the equation for b: 3b = 12 b = 3 · 12 b = 36 describe the mistake that arnold made.

Explain how you can find the missing fraction in 3 4/5 / (blank) 2 5/7. then find the missing fraction.