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One piece is 80 feet - the other is 8 feet !
piece a has a greater length than piece b (a>b)
x the length of the shorter piece 3·x the length of the longer piece x + 3·x the length of the whole board = 4·x = 76" x = 76" / 4 = 19.
It's the length of each piece, if you cut up one inch into ten equal pieces.