Hello Abhishek,

Try dividing by the highest common factor, to reduce the fraction into simplest form.

Search on internet the different ways to solve these questions in almost no time. There are several books that offer tricks and short-cuts to solve complex divisions within seconds. Or refer to some free online videos on youtube.

For more mathematics tricks and techniques to solve quant, by CAT toppers, please refer the below mentioned article:

https://bschool.careers360.com/articles/cat-tricks-for-quant-dilr-vrc

Hope this Helps