3rd one ( not 20 characters so ASHWDHWHEIUCNEJEIH)
The ratio of areas is the square of the scale factor, so that factor is
√(320/180) = 4/3
6
The upside down U means intersection
A intersect B intersect C is where all 3 circles overlap.
Sum up all the numbers to get 50
P (a intersect b intersect c) = 6/50 = 3/25
1. Convert percent into decimal (it will help)

2. Convert Decimal to fraction
The value for x is 9 because:
7x +49 = 2x + 94
7x-2x=45
5x=45
x=45/5
x=9