Question 1: An irregular shaped object is placed in a eureka can filled with water. The initial water level in the can is 100 mL. After placing the object in the can, the water level rises to 150 mL. The mass of the object is 50 grams. Calculate the density of the object.

Diagram:
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Question 2: An irregular shaped object is placed in a measuring cylinder filled with water. The initial water level in the cylinder is 50 mL. After placing the object in the cylinder, the water level rises to 75 mL. The mass of the object is 30 grams. Calculate the density of the object.

Diagram:
```
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|_______|
```

Question 3: An irregular shaped object is placed in a eureka can filled with water. The initial water level in the can is 200 mL. After placing the object in the can, the water level rises to 250 mL. The mass of the object is 80 grams. Calculate the density of the object.

Diagram:
```
_______
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|_______|
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|_______|
```