Answer:
No. Of Males can be x
No. of Females can be y
The difference between the no. of males and females is 30
so x - y = 30
with ratio we can get 4x and 9y
now subsitute the value of x
9y/4 - y = 30
y = 24 females
x = 54 males
so the total no. of people at the party will be = x + y = 78
Step-by-step explanation:
