A book has a font and a back and 400 pages. The front and back cover are each 0.9mm thick, measured to 1 decimal place. Each page is 0.13mm thick measured to 2 decimal places calculate the minimum thickness of the book

53.8 mm

Step-by-step explanation:

Front page and a back page + 400 pages.

The front and back cover are each 0.9mm thick, measured to 1 decimal place.

Total thickness of front and back page = 0.9mm × 2

= 1.8 mm

Each page is 0.13mm thick measured to 2 decimal places

Total number of pages = 400

Total thickness of the pages = Thickness of each page × Total number of pages

= 0.13mm × 400

= 52 mm

minimum thickness of the book = Total thickness of front and back page + Total thickness of the pages

= 1.8mm + 52mm

= 53.8 mm

The minimum thickness of the book is 53.8 mm

5x+2x=49

7x=49

x=7. 35 apples