Answer: 35 whole numbers.
Explanation:
You could just find the difference between the numbers or list the numbers.
75-40=35
Or, 41,42,43,44,45,46,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74.
All these numbers are whole numbers between 40 and 75 and they all count up to 35.