[Q]: Which of the following solutions is better for the following goal:
placemat

[A]: be rolled up in the drawer

[Q]: Which of the following solutions is better for the following goal:
To make precise holes in a papercraft helmet.

[A]: Use a scalpel to make the hole.

[Q]: Which of the following solutions is better for the following goal:
Keep salt from clumping inside a shaker.

[A]: Place some rice in the shaker to absorb moisture from the salt.

[Q]: Which of the following solutions is better for the following goal:
To clean a penny

[A]:
Mix together 1 teaspoon of salt and 1/4 cup white vinegar in a glass or plastic bowl, and stir until the salt is completely dissolved. Place a half dozen old, tarnished pennies into the solution, wait 10-20 seconds, then remove them and place them into a bowl of water. Take them out of the water, dry them on a paper towel and voila, shiny new pennies!