#### Answer

60 cc

#### Work Step by Step

We have 10 cc of 60% solution, and need to add 25% solution until it is diluted to 30%.
25%(x) + 60%(10) = 30%(10+x)
In decimal:
.25x + 6 = .3(x + 10)
Simplify:
.25x + 6 = .3x + 3
6 = .05x + 3
3 = .05x
60 = x