Question 1210402
if to choose x number of dogs and y number of kids, and x and y only whole non-negative numbers, then
{{{4x+2y=30}}}
{{{2x+y=15}}}
{{{y=-2x+15}}}
Finding a good solution should be easy to do.   Maybe try a graph to identify it.


Would  (2,11) work?  It's on the line.
{{{4*2+2*11}}}
{{{8+22}}}
{{{30}}}----------yes.  2 dogs and 11 kids.


Can you find others which also work?