Please Help me!!!! Please!!!!!!!!!!!!!!!
A chemistry teacher asks his students to make a 5% sodium solution. The students are given 9 liters of 15% sodium solution that they are to completely mix with water. How many liters of water must be mixed to get the 5% solution???
Does anyone know the formula??

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Please help in any way possible

(c)(a)+(c)(a)=(combined concentrate)(total amount)
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