Raju reads ${\frac{2}{3}}^{r d}$ of a book. He finds that still there are $100$ pages to be read. The total number of pages in the book are?
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Solution

If Raju reads ${\frac{2}{3}}^{r d}$ of a book. He will still have ${\frac{1}{3}}^{r d}$ of the book to complete.
So, ${\frac{1}{3}}^{r d}$ of the total number of pages is given as $100$ . Hence, the total number of pages are $(3 \times 100) = 300$

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