please help me to solve this

"christina maurice [email protected] [thechemistrycluster]" <[email protected]> Tue, 20 May 2014 12:33:55 -0700 (PDT)
Newsgroups gmane.science.chemistry.the-chemistry-cluster
Message-ID <[email protected]>
A volume of 54.0ml of water is mixed with 144ml of 0.357M NaNO3 solution. What is the final concentration of  sodium nitrate solution?