If the average weight of a rock in Jim's pail is 1.5 pounds, and he makes a total of $60 from the sale, then he must have sold a total of $60/$4 = 15 pounds of rocks.
Since the average weight of a rock is 1.5 pounds, then Jim must have sold a total of 15/1.5 = 10 rocks.
Therefore, there were 10 rocks in Jim's pail.
#### 10
The answer is: 10
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
If the average weight of a rock in Jim's pail is 1.5 pounds and a local rock collector pays him $4 for every pound of rocks, and Jim makes a total of $60 from the sale, how many rocks were there in the bucket?

### Answer:
