that means L√N/M^3 = k, which is constant so you want N such that 4000√N/1000 = 108√4/3^3 √N = 108*2/27 * 1000/4000 = 2 N = 4 makes sense, since 108/27 = 4000/1000 They could have chosen a better set of values, I think
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