Alright. So Ella is earning some money mowing lawns over the summer. We are told for every lawn that she mows, she will get paid #$15#. Let's write this down to show what we mean.

#color(white)(aaaaaaaaaaaa)("1 lawn mowed")/($15 )#

Her goal is #$600#. So let's write what our goal is, or our given, and figure out how many lawns she needs to mow.

#color(white)(aaaaaaaa)(cancel$600)/1*("1 lawn mowed")/(cancel$15 ) = "40 lawns mowed"#

She will need to mow #40# lawns in order to earn her goal of #$600#

But if she is earning #$15# per lawn, let's hope all the lawns are equal in size because #$15# doesn't seem like a lot! Or, at least to me it doesn't.