Based on the image you provided, the question asks:

"Mark secured 75% of the total marks and got 420 marks. How many marks did a student who secured 85% get?"

To solve this, first, we find the total number of marks by using Mark's score:

$\text{Total Marks} = \frac{\text{Marks obtained by Mark}}{\text{Percentage secured by Mark}}$ $\text{Total Marks} = \frac{420}{0.75}$

Let's calculate the total marks.