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how do you do this...

9/21=12/b

b=?
im new to this.. xp
 27 févr. 2014

Meilleure Réponse 

 #1
avatar+5454 
+11
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
 1 mars 2014
 #1
avatar+5454 
+11
Meilleure RéponseHi 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
kitty<3 1 mars 2014

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