Though your question is not clear, still what i understand from it, i am giving its answer.

A manuscript with 49% of similarity index is not acceptable in a good reputed journal (SCI). Generally it must be less than 15%.

Kindly try to clarify your question.

Presentation "IF YOU WANT TO...", by: Asst. Prof. Dr. Emad Kamil

Emad

I agree it is high. I do not recommend you to submit to a journal in this fomat. Paraphrase and test again.

Hi,

I do not believe that plagiarism has a percentage.It either exists or not.

Though your question is not clear, still what i understand from it, i am giving its answer.

A manuscript with 49% of similarity index is not acceptable in a good reputed journal (SCI). Generally it must be less than 15%.

This is not scientifically acceptable. Depending on the Journal (high-impact), similarity index may range from the 5% to 12%.

Hi,

You could publish your paper in the journls Journal of Combinatorial Mathematics and Combinatorial Computing, or Linear Algebra and its Applications .

cited text of other authors should be covered in double inverted quote sign example ".............." (Kale, 2018). then put author surname, comma and publication date in parenthesis. Because anti-plagiarism software tool understand only double inverted quote sign ("......") and sentences cited from another source is excluded from plagiarism detection during scanning of text by anti-plagiarism software tool. Please be follow this style.

You can avoid the plagiarism by making accurate paraphrasing. In all cases, reference should be mentioned to the author of the original text.