Question 271365
Louis makes 30 dollars per yard mowed, so his profit from that is 30 times the number of yards or {{{30x}}}.  Louis makes 20 dollars per lawn weeded, so his profit from that is 20 times the number of lawns or {{{20y}}}.  Added all together {{{30x+20y}}} he wants at least 150 dollars.

Solution:
{{{30x+20y>=150}}}