calculating OG from addition of juice to wort

Please help.

I brewed a 5.7 gallon batch of 1.070 wort.
I am adding half a gallon of 1.050 juice to the wort during fermentation.
How do I calculate what the new OG of the wort + juice would be?

(5.7x70) + (.5x50) divided by 6.2 gal.

Thanks Denny! That’s exactly what I thought but was getting conflicting info elsewhere.

Can’t imagine why