Final answer:
To find the total number of folders, calculate the number of red and blue folders separately and then add them together. The option that is closest to the total number of folders is 400.
Step-by-step explanation:
To find the total number of folders, we need to calculate the number of red folders and blue folders separately, then add them together.
For the red folders, Mrs. Yasmin buys 5 boxes with 36 folders in each box. Therefore, the total number of red folders is 5 x 36 = 180 folders.
For the blue folders, Mrs. Yasmin buys 6 boxes with 32 folders in each box. Therefore, the total number of blue folders is 6 x 32 = 192 folders.
Adding the number of red and blue folders together, we get 180 + 192 = 372 folders.
The option that is closest to the total number of folders, 372, is option (a) 400.