Mona read $\frac{1}{3}$ of the total number of pages in the book. If 40 pages are still not read, how many pages did she read?

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Solution

The correct option is D 20
The visual representation of the number of pages in the book are shown here, where the shaded region represents the pages read by Mona.
Two blocks are not shaded.
Number of unread pages = 40
So, the number of pages represented by each block = 40 $\div$ 2
= 20
As the pages read are represented by the shaded region, and there is only one shaded block.
So, the number of pages read by Mona = 20.

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