There are two ways you can compare fractions:
1. Cross multiply : This process will help you quickly figure out the greater between two fractions, but if we have 2 or more fractions, then we will have to compare the fractions taking two at a time.
2. LCM : This is the best process to compare two or more fractions. The process here involves keeping the denominators of the fractions the same and comparing the numerators.
The LCM is the more preferred of the two processes in questions such as this one. When working with fractions, the denominators of the fractions are key to solving the question. While dealing with word problems with fractions the LCM of the denominators of the fraction is the best value to plug in, instead of trying to solve the question with variables.
The fractions we are working with here are 2/3, 5/6, 11/18, 13/18 and 3/4. If we make the denominators the same, it will become easier to compare all of them together.
The LCM here is 36, so the fractions now become 24/36, 30/36, 22/36, 26/36 and 27/36.
Now the question asks for which of the following fractions are greater than 24/36 and less than 30/36, Clearly we have two possibilities here, 26/36 and 27/36 which are 13/18 and 3/4.
The answer here is D.