Nida has 50 chocolates in which some are in 3 filled boxes and 5 pieces are not in a box. Her friend brought 25 pieces of chocolates. If all chocolates must be placed in a box, how many more boxes do they need?
There are 50 - 5 = 45 chocolates in three boxes.
So, each box is filled with 45/3 = 15 chocolates.
5 + 25 = 30 chocolates are needed to be placed in boxes.
Hence, they needed 30/15 = 2 boxes for the 30 chocolates.