Question

Bob only plays hockey on Tuesday, Wednesday and Friday.

Ron only plays hockey on Thursday and Sunday.

How many days each week does at least one of them play hockey?

Answer 1

Let's solve the problem with the help of Set thoery.

Let Set A be the given days Bob only plays hockey.

Set A = { Tuesday, Wednesday, Friday}

Let Set B be the given days Ron only plays hockey.

Set B = { Thrusday, Sunday}

So, (Set A Set B ) = 0 (Null Set) ---------> which denotes days in which both of them plays together.

(Set A Set B ) = { Tuesday, Wednesday, Thrusday, Friday, Sunday} ------> which denotes days in each week at least one of them play hockey.

So, Answer. 5 days. { Tuesday, Wednesday, Thrusday, Friday, Sunday}