Question

Which of the following is rational no.
1) root 2
2)root pi
3)root 7
4)root 5/25
5)root 64/49

Explain how??

Answer 1

The answer is 5) root 64/49
as after simplification it would be
$\sqrt{64 \div 49}$
$= 8 \div 7$
=8/7