Each cake tin is 25cm in diameter. How many cake tins fit on a 600mm X 500mm tray

From the information given, the tins are circular / cylindrical because they have a diameter.

So we need to find out the base area of each tin.

Base Area = π r²

radius here will be 25/2 = 12.5

Area = 3.14 * 12.5 * 12.5

Area = 490.6cm²

For the tray the dimensions are 600mm and 500mm which seem to allude the trays are of a regular shape such as a rectangle. Let us assume it is so.

600mm = 60cm, and 500mm = 50cm

Area = L * w

Area = 50 * 60 = 3000cm²

Each tray will fit 3000 : 490.6 = 6.1

6 cake tins will fit into one tray