The ratio of the length and breadth of a rectangular field is 3 : 2. If the perimeter is 80m, find its area.

The ratio of the length and breadth of a rectangular plot is 5 : 4. If the breadth is 20 meters less than the length, what is the perimeter of the plot?

The ratio of the length and breadth of a rectangular plot is 7 : 5. If the perimeter is 480 meters, find the area of the plot.

The ratio of the volume of two cubes is 8 : 27. Find the ratio of their surface areas.