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BeautifulBooks123
A: He had $77 in his account before mowing lawns.
In order to solve for A you have to first divide 234 by 2. You will get 117. Then you have to subrtract 40 from 117 to get 77. 
Apocrophon
Let's rephrase the problem:
Trey saved x money. He earned $40 mowing lawns, bringing his total money to (x + 40). His parents double that amount, so he has (x + 40) + (x + 40), or 2(x + 40). That amount is equal to $234. So you can make the equation;
[tex]2(x+40)=234\\ Solve\\ x+40=117\\ x=77[/tex]
So he saved $77 before he mowed the lawns.

I'm not sure exactly what they meant by comparing the two, but I hope this really helps :D

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