Question

By what number should 5 4/7 be divided to obtain 6

Answer 1

Let Required number be x so, 54/7x = 6
                             
So, x = 54/6*7
  x = 9/7

Hence,   54/7 be divided by 9/7 to obtain 6

Answer 2

let the required number be x
5 4/7 = 39/7
so,
39/7 ÷ x = 6
x = 39/7 ÷ 6
x = 39/7 × 1/6
x = 39/42