Let x = first week, then x+5 = second and 2(x+5) = third week. They should sum to 431.
Solve for x.
a girl scout troop sold cookies. if the girls sold 5 more boxes the second week than they did the first, and if they doubled the sales of the second week for the third week to sell a total of 431 boxes of cookies, how many did they sell each week?
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