The speed of sound in relation to temperature

[HalcyonStorm]

What is the temp. of dry air if the speed of sound is 339 m/s?
I have been using this formula: v = 331 x (temp./273 + 1)
I've tried for at least 2 hours and cannot get the answer. Please help me.

 

[aim1732]

Please show us some work so we can help you better.

 

[HalcyonStorm]

Sorry for the late response guys, I was at school. I managed to figure it out before the lesson, I got it right :).
Thanks anyways.