Question

In a stack there are 5 books each of thickness 20 mm and 5 paper sheets each of thickness 0.016 mm. What is the total thickness of the stack?

Answer 1

Hint: In this question first calculate the thickness of 5 books and then thickness of 5 sheets with the given data. Hence, the total thickness of the stack is the sum of thickness of 5 books and the thickness of 5 sheets. So, use this concept to reach the solution of the problem.

Complete step-by-step answer:

Given,
Number of books = 5
Thickness of each book = 20 mm
So, thickness of 5 books \[ = 5 \times 20 = 100{\text{ mm}}\]

Number of paper sheets = 5

Thickness of each paper sheet = 0.016 mm

So, thickness of 5 paper sheets \[ = 5 \times 0.016 = 0.080{\text{ mm}}\]
Here total thickness of the stack = thickness of 5 books + thickness 5 papers
                                                           = 100 mm + 0.080 mm
                                                           = 100.08 mm

Therefore, the total thickness of the stack is 100.08 mm or 1.0008 cm

Note: We can write the total thickness of the stack in terms of millimeters (mm) or in terms of centimeters (cm). To convert millimeters (mm) into centimeters (cm) we use the conversion \[100{\text{ mm}} = 1{\text{ cm}}\].