Answer:
The Total surveys were submitted was 431
Step-by-step explanation:
HMMS recently learned that the Percentage of students and parents are happy with their school = 78%
The number of surveys showed that parents were happy = 336
The Total Percentage of students and parents are happy with their school = 100%=x
Therefore ,
78% = 336
100% = x
x =

x= 430.7
The Total number of surveys were submitted was 431