Question 115
It is given that the bookshelf can fit $9$ of the same thick books, but the $10$th one will not fit anymore. Similarly, it can hold $15$ of the same thin books, but $16$th will not fit anymore. Is it possible for that shelf to hold simultaneously:
a) $6$ thick and $5$ thin books?
b) $7$ thick and $5$ thin books?
a) $6$ thick and $5$ thin books?
b) $7$ thick and $5$ thin books?