Question 72706
To make it easier, first notice that the number of lawns mowed has to be even.
If it were odd, The total money earned would have to end in "5"
Make a chart with m = # lawns mowed and w = # of "works" done
{{{25m + 40w = 370}}}
m..w
2..8
4..x
6..x
8..x
10..3
12..x
14..x
Try the combinations yourself. The only ones that can possibly 
give you $370 is m=2,w=8 
and m=10,w=3