Question

find two rational numbers between 1/6 and5/7

Answer 1

1/6                  5/7
now multiply them with each others denominators
=  1/6*7/7             5/7*6/6
=  7/42                  30/42
therefore 2 rational no.s b/w 
=  7/42 , 8/42  ,  9/42 ,...................,30/42