To find the average mass of the three objects, you can use the formula for the average:
\[ \text{Average} = \frac{\text{Sum of all values}}{\text{Number of values}} \]
In this case, you have the masses 25g, 20g, and 30g.
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First, calculate the sum: \[ 25g + 20g + 30g = 75g \]
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Then, divide by the number of values (which is 3): \[ \text{Average} = \frac{75g}{3} = 25g \]
So, the average mass is 25g.