Answer: The required decimal that would represent the amount of seats left for Section 3 and 4 is 0.4.
Explanation:
Since we have given that
total number of people in stadium that can hold = 250
Number of people in Section 1 and Section 2 = 150
Number of seats left for Section 3 and Section 4 is given by

Therefore, decimal represent the amount of seats left for Section 3 and 4 is given by

Hence, the required decimal that would represent the amount of seats left for Section 3 and 4 is 0.4.