To estimate your KCET rank, both your board exam marks and your KCET exam marks are considered with equal weightage (50:50).

First, we need to calculate your percentage in both exams for the relevant subjects (Physics, Chemistry, and Mathematics, assuming you are aiming for engineering).

Your board marks are 284 out of 300. So, your board percentage is: (284 / 300) * 100 = 94.67%

Your KCET marks are 80 out of 180. So, your KCET percentage is: (80 / 180) * 100 = 44.44%

Now, to calculate your CET rank determining score, we take 50% of each percentage and add them together: CET score = (50% of Board Percentage) + (50% of KCET Percentage) CET score = (0.50 * 94.67) + (0.50 * 44.44) CET score = 47.335 + 22.22 CET score = 69.555

Based on previous year's trends and available data, a KCET score around 70 often corresponds to a rank somewhere in the range of 40,001 to 50,000 or even higher .

However, it's crucial to understand that this is just an estimate based on previous year's data and the general trend. The actual rank can vary depending on factors such as the overall performance of all candidates, the difficulty level of the exam this year, and the normalization process if applicable to different boards.

For a more precise prediction, you might want to use online KCET rank predictor tools that take into account the 50:50 weightage and attempt to correlate scores with likely ranks based on past data. Once the official KCET results are released, you will get your actual rank.

I hope this helps.