A glass tank holds 28 heads in total — some centipedes (100 legs each), some toads (4 legs each).
There are 832 legs.
How many toads are there?

Q: A glass tank holds 28 heads in total — some centipedes (100 legs each), some toads (4 legs each). There are 832 legs. How many toads are there?

22 toads (and 6 centipedes).. Set up two equations: c + t = 28; 100c + 4t = 832. Solve: c = 6, t = 22. Sometimes the trick is just trusting the algebra.

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22 toads (and 6 centipedes). — Set up two equations: c + t = 28; 100c + 4t = 832. Solve: c = 6, t = 22. Sometimes the trick is just trusting the algebra.