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# Proportion

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Suppose a is directly proportional to b, but inversely proportional to c. If c when b = 9 and c =5, then what is c when b=3?

Jun 14, 2022

#1
+14081
+2

What is c when b=3?

Hello Guest!

$$a:b=c:a\\ a^2=bc\\ a:9=5:a\\ a^2=45\\ bc=45\\ 3c=45\\ c=15\\ \color{blue}c=15\ when\ b=3$$

!

Jun 14, 2022
#2
0

$I \ don't \ like \ you \ asinus \ \begin{vmatrix} dum&dum&dumb \\ dum&dum&dumb \\ dum&dum&dumb \end{vmatrix}$

Jun 14, 2022
#3
+14081
+1

Hello Guest!

I'm sorry, but there's nothing that can be done.

!

asinus  Jun 14, 2022
#4
+579
+2

Nice one Asinus!!!!

Vinculum  Jun 14, 2022