Haylee has 3 dozen guppies, which is equal to 3 x 12 = 36 guppies.
Jose has half as many guppies as Haylee, so he has 36/2 = 18 guppies in his tank.
Charliz has one-third of what Jose has, so she has 18/3 = 6 guppies in her tank.
Nicolai has 4 times as many guppies as Charliz, so he has 6 x 4 = 24 guppies in his pond.
Altogether, the four friends have 36 + 18 + 6 + 24 = 84 guppies.
#### 84
The answer is: 84
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
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?

### Answer:
