Question 1103517
When the information for a problem like this is given as a fraction, I find it much easier to set up the problem using ratios.<br>
In this problem, where the information is that the number of sailors is 2/3 the number of soldiers, I see that as saying the ratio is 2:3.  So
let 3x = # of soldiers
then 2x = # of sailors<br>
Then
{{{3x+2x=30}}}
{{{5x=30}}}
{{{x=6}}}<br>
The number of soldiers is 3x=18; the number of sailors is 2x=12.