Number between 6/11 and 67/99

A. 11/18

B. 69/99

C. 24/33

D. 26/55

Simple, find what 6/11 and 67/99 is in decimal form

6/11=0.545454545 (repeating)

and

67/99=0.67676767 (repeating)

then do the same with your answer choices:

11/18=0.61111111 (repeating)

69/99=0.696969697 (too high)

24/33=0.727272727 (repeating) (too high)

26/55=0.472727273 (too low)

Then, from here it's simple to see what the answer is, 11/18, is your answer.