A piece of carbon 31/32 inch thick has a copper plating of 1/64 inch on each side. What is the total thickness?

• A. 1/2 inch
• B. 1 inch
• C. 1 1/4 inch
• D. 1 1/2 inch

Answer: (B)

When you have material thickness with plating on both faces, you add the base thickness and the total plating from both sides.

The base is 31/32 inch. Copper plating on each side is 1/64 inch, so two sides add up to 2 × 1/64 = 1/32 inch. Convert to the same denominator: 31/32 is already over 32, and 1/32 is the remaining piece. Adding them gives 31/32 + 1/32 = 32/32 = 1 inch.

So the total thickness is 1 inch.