Question

how many square meters of glass will be required for a window, which has 12 panes ,each measuring 25cm by 16 cm

Answer 1

For each glass pane, you will require 25*16 cm^2 of glass.
Thus, for 12 such glass panes you will require 12*25*16 cm^2 of glass.
Final answer:- 4800 cm^2 of glass will be required