Yes it is. Copper is the same mass and volume. Plus all pennies are made of copper
The turkey limits bc you can make 9 sandwiches with 9 turkey and 12 sandwiches with 25 bread
Kia's remaining water has a mass of 50g. You can set it up as a proportion knowing that 100ml of water has a mass of 100g and thus 50ml of water would weight 50g
106.4 is going to be your answer