Question 619782
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Hi,
Standard Lumber has 8 foot and 10-foot two-by-fours.
if Aaron bought {{{90}}} two-by-fours with a total length of 844 feet, 
how many represented by {{{highlight(x)}}} were 8 feet long?
Question states***
  8x + 10(90-x) = 844ft
      -2x = -56
        x = 28 were 8ft long
CHECKING our Answer***
28·8ft + 62·10ft = 224ft + 620ft = 844ft