Question

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

• A. $1.0008\times {10}^2$ mm
• B. $1.0008\times {10}^3$ mm
• C. $1.0008\times {10}^4$ mm
• D. None o these

Answer 1

The correct option is A $1.0008\times {10}^2$ mm

Given:

No. Of books = 5

Thickness of each book = 20 mm

No.of paper sheets = 5

Thickness of each paper sheets = 0.016 mm

Total thickness of the stack= thickness of 5 books + thickness of 5 paper sheets

= 5 × 20 + 5 x 0.016

= 100 + 0.080

= 100.08 mm

The total thickness of the stack = 1.0008 x ${10}^2$ mm