the expression 6 times radical 20 divided by 3 times radical 5 is equvilent to

Question

1. 3 radical 15
2. 2 radical 15
3. 8
4. 4

Answer 1

6√20/3√5
= 6√4√5/3√5
= 6x2√5/3√5
= 12/3
= 4