Answer: Only 6 milk chocolates are expired.
Step-by-step explanation:
Since we have given that
Total number of chocolates = 15
Types of chocolates are as follows:
1) Milk chocolates
2) Dark chocolates
3) Mix
According to question,
Number of milk chocolates that are expired = 6
Number of dark chocolates that are expired = 3
total number of chocolates that are expired = 6+3=9
And we have mentioned that 6 milk chocolates that are not expired.
and 9+6=15
No other chocolates are left in a case of chocolate.
so, only mentioned 6 milk chocolates are expired.