Final answer:
The new average after each of the five numbers is increased by 4 is 89.
Step-by-step explanation:
The average of five numbers is 85. If we increase each of the numbers by 4, we are effectively adding a total of 20 (5 numbers × 4) to the overall sum of the original numbers. Since the average is calculated by dividing the total sum by the number of values, and we're adding an equal amount to each number, the average of the new set of numbers will also increase by 4. Therefore, the new average after each number is increased by 4 is 85 + 4, which equals 89.