Explanation:
m = millipedes pairs of legs = 336 m
n = centipedes = 38-m pairs of legs = 175 (38-m)
summed this equals 19740 / 2 = 9870 pairs of legs
336m + 175 (38-m) = 9870
solve for m = 20 millipedes then there are 38 - m = 18 centipedes
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