Explanation:

Enter at the left side with 30C to PA sea level.

Move right to mass reference line paralleling the graph lines to the mass 2940 lbs.

Move right to the wind reference line then up and left to 10kt TW.

Move right to obstacle height reference line then up and left to read 1900ft.

It is believed that the exam answer to this question is incorrectly given as 1300ft.

To achieve this they would have incorrectly used 10 kt HW. If seen in the exams appeal this through your school.