Ben, cam, and justin are lumberjacks. the number of trees they chop down is given by b+2c+3j, where b is the number of hours ben spends chopping, c is the number of hours cam spends chopping, and j is the number of hours justin spends chopping. how many trees do they chop down after ben spends 8 hours chopping, cam spends 3 hours chopping, and justin spends 4 hours chopping?