In what ratio must a 10% salt solution be mixed with a 25% salt solution to get a 16% solution?

Explanation

1. 01

   Alligation works on strengths just as on prices: 10% : 25% $= (25 - 16) : (16 - 10) = 9 : 6$.

2. 02

   $9 : 6 = 3 : 2$.