Question

Another stack of books is 43 inches tall. Each book is 1/2 inch thick. Write an expression that represents the number of books in the stack

Answer 1

86 books

Explanation:

A stack of books is 43 inches tall.

Each book is
`(1)/(2)` inch thick.

To find the number of books in tha stack, divide the height of the stack by the height of the book:

`43:(1)/(2)`

The division by the fraction
`(1)/(2)` is equivalent to the multiplication by the fraction
`(2)/(1),` so

`43:(1)/(2)=43\cdot (2)/(1)=43\cdot 2=86`