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Four supplementary answers to mathematics
Solution: If all spiders have legs: 8 * 18 = 144 (strips).

There are many actual situations:144-118 = 26 (articles)

Because dragonflies and cicadas have six legs, and each has less than eight: 8-6 = 2 (bars).

So the number of dragonflies and cicadas is only 26/2 = 13.

Number of spiders: 18- 13 = 5 (only)

Because spiders have no wings, dragonflies and cicadas *** 13 only have 20 pairs of wings. So:

If all dragonflies have two pairs of wings, then they have wings: 2 * 13 = 26 (right).

Beyond the actual situation: 26-20 = 6 (right)

Because each cicada has fewer wings than a dragonfly: 2- 1 = 1 (right)

So the number of cicadas is 6/ 1 = 6 (only)

Number of Dragonflies: 13-6 = 7 (only)