5 books, each 20mm thick, and 5 sheets of paper, each 0.016mm thick, are stacked together. How thick is the stack altogether?

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100.08mm

99mm

95.024mm

101.002mm

answer is A.

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Detailed Solution

Concept: We must determine the entire thickness of the stack in order to answer the question. There are 5 books and 5 papers in the stack. Since each book and paper has a specified thickness. Calculate the combined thickness of 5 books and 5 papers, then add that thickness. Five books and five pieces of paper make up the entire thickness of the stack.
Each book is 20 mm thick.
Since five books are stored, their combined thickness

.
Once more, each sheet of paper is 0.016mm thick.
There are 5 sheets of paper in the stack.
We must now multiply the total number of paper sheets by the thickness of each paper.