Question 28
A tiler has done 20% of the overall work. On the next day, he does 70% more of what is previously done. If he needs to lay the tiles for the total area of 350 square meters, how many square meters have not been tiled yet?
Editorial note: The English source wording is ambiguous; state and justify your interpretation.
Editorial note: The English source wording is ambiguous; state and justify your interpretation.