Answer:
ask math because it will tell you
Step-by-step explanation:
X = total amount of people
80% of x = 540
.8x = 540
x = 675
There were 675 people
suppose 4:4:7 be 4x, 4x, 7x
or, 15x = 180°
or, X = 180/15
or, X = 12
therefore,
4x = 4x12= 48
4x= 4x12= 48
7x= 7x12= 84
so if you plus all of them you get 180
X is 10
I have shown the calculation in the attachment.