If I have a baking tray 700mm by 500mm how many 25cm

cakes could I fit on there?

So assuming that 25 cm is the area or 25 square cm then each cake (assuming it's a square) is 5cm by 5cm

so we find the total area of the baking tray and divide by 25

area=legnth times width

area=700 times 500

area=350,000

divide by 25

350,000/25=70,000/5=14,000

14,000 cakes will bet on the baking sheet