Find in metre the height of a pile of 25 books if each book is 3cm 5mm thick.

Given that height of each book is 3cm 5mm

We need to find the height of a pile of 25 books in meters

1cm = 10mm

so 3cm = 30cm
3 cm 5 mm = 30 mm + 5 mm
= 35 mm

The height of a pile of 25 books is

25 X 35
= 875 mm

We will convert into meters

1 mm = 0.001 m
875 mm = 0.001 X 875 m
=0.875 m

Height of 25 pile of books is 0.875 m where the height of one book is 3cm and 5mm