An old lady has 125 cats. Seven of them are old, 9 of them are her favorite, 5 of them are both old and favorite. How many of them are neither old nor favorite.

The number of cats neither old or favorite = 114

Step-by-step explanation:

Total number of cats = 125

Old cats = 7

Favorite cats = 9

Both favorite and old = 5

Number of cats either old or favorite = 7 + 9 - 5 = 11

⇒ Number of cats neither old or favorite = Total number of cats - Number of cats either old or favorite

⇒ Number of cats neither old or favorite = 125 - 11 = 114

These are the number of cats neither old or favorite.