math

Hi linkandzeldaa,

So you said:
9/21=12/b
Write that as a proportion, basically:
9 over 21 equals 12 over b

Now cross multiply (the diagonals of a proportion should be equal), so:
9b = 21*12
Simplify.
9b = 252
Divide both sides by 9 to find b:)

b = 28