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

Solution

∵ Thickness of one book = 20 mm
∴ Thickness of 5 books = 5 × 20 mm = 100 mm Again,
Thickness of 1 paper sheet = 0.016 mm
∴ Thickness of 5 paper sheets = 5 × 0.016 mm
= 0.080m
∴ Total thickness = 100 mm + 0.080 mm
= 100.08 mm = 1.0008 × 10² mm