The ratio of coconuts to mangosteens is 2:7. If 348 mangosteens was added, the ratio of coconuts to mangosteens will be 2:11. How many more mangosteens than coconuts are there in the end?
c/m = 2/7
c/(m+348) = 2/11
m=609
c = 174
609+348-174 = ____