Solution:
Because dragonflies and Zen have the same number of legs.
So treat them as a whole.
Suppose they are all spiders.
Then * * * has legs 8× 18= 144.
Then it is more than the actual144-128 =16.
Dragonflies and cicadas *** 16÷(8-2)=8.
Suppose all eight are dragonflies.
Then a * * * has wings 8×2= 16.
More than the actual 16- 13=3 pairs.
So there are 3 cicadas (2- 1) = 3 cicadas.
Dragonflies have 8-3=5.
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