Question

Adam, Bill and Caleb had a total of $2500 at first. The ratio of Bill's
money to Caleb's money was 8:5. After Adam and Bill each spent
half of their money, the three boys had $1500 left. How much did
Adam have at first?
a+b+c = 2500
b/c = 8/5
a/2 + b/2 = 1500
Now just solve for a. Post your work if you get stuck.
You might want to clear fractions first, then use substitution.

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