Given two elements of the lamplighter group g = (n,(. . . , l−1, l0, l1, . . .)), h = (m,(. . . , k−1, k0, k1, . . .)), how can one determine if they are conjugates?

During the election for class president, 40% of the students voted for kellen, and 60% of the students voted for robbie. 500 students voted in total. how many more students voted for robbie than for kellen? answer with work : )