Haylee has 3 dozen guppies in her aquarium. Jose has half as many guppies as Haylee in his tank. Charliz has one-third of what Jose has in his tank. Nicolai has 4 times as many guppies as Charliz in his pond. How many guppies do the four friends have altogether?
Step-by-step reasoning:
84
Haylee has 3 x 12 = 36 guppies.

Jose has 36 / 2 = 18 guppies.

Charliz has 18 / 3 = 6 guppies.

Nicolai has 6 x 4 = 24 guppies.

Altogether, the four friends have 36 + 18 + 6 + 24 = 84 guppies.

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The final answer: 84