Volume of the right stack would be 390 cubic millimeters
The volume of a stack of coins depends on the volume of a single coin multiplied by the number of coins in the stack. If both stacks are made up of the same number of pennies (15 pennies), and if we assume that each penny has the same volume, then the total volume of both stacks would be the same.
Here's a step-wise approach:
1. Volume of One Stack: You are given that the volume of the stack on the left is 390 cubic millimeters.
2. Volume of One Penny: To find the volume of one penny, you divide the total volume of the stack by the number of pennies in the stack.
3. Calculate Volume of One Penny:
4. Volume of the Other Stack: Since the other stack also has 15 pennies, and assuming the pennies are identical in volume, the total volume of the other stack would be the volume of one penny multiplied by 15.
5. Calculate Volume of the Other Stack:
=26 * 15
=390 cubic millimeter