Answer:
150 sandwich platters.
Explanation:
Cassandra ordered sandwich platters for a party.
There were 6 different kinds of sandwiches with 5 of each kind on a platter.
So total types of sandwich platters are = 6 × 5 = 30
Cassandra ordered 5 platters of all types = 30 × 5 = 150
Cassandra ordered total 150 sandwich platters.