Ax/100 = 15/90x = 100(15/90)
x = (10/9)15
x = 10(5/3)
x = 50/3
x = 16.667
x = 16% or 2/3
b)56/x=100/10(56/x)x=(100/10)x
56=10x
56/10=x
5.6=x
x=5.6
c)180/x=100/90
(180/x)x=(100/90)x
180=1.11111111111x
180/1.11111111111=x
162=x
x=162
d)300/x=100/25
(300/x)x=(100/25)x
300=4x
300/4=x
75=x
x=75
f)20/x=100/55
(20/x)x=(100/55)20
x=36.36
x=36
I don't know how to do e), sorry.
