Question 126484
20*15=300 m^2 is the area of the veranda.
(20+2*2)(15+2*2)
24*19=456 m^2 total area of veranda plus the addition.
456-300=156 m^2 area of the addition.
156/(2*2)=156/4=39 2X2 m tiles will do the job. 
NOTE: one tile will have to be cut in half.