ANSWER
![(A\cup B)\operatorname{\cap}C=\lbrace10,20\rbrace]()
Step-by-step explanation
Set A contains multiples of 10 from 10 to 90:

Set B contains multiples of 30 from 30 to 120:

The union of two sets is the set that contains all the values in both sets. Therefore, A U B is:

Set C contains even numbers from 2 to 20:

The intersection of two sets is the set of values that exist in the two sets. Therefore, (A U B) n C is:

That is the answer.