Answer
The book has a total of 351 pages.
Work Step by Step
Let x = total number of pages of the book
Then:
$\frac{1}{3}x = 117$
Multiply 3 to both sides of the equation:
$3(\frac{1}{3}x) = 117(3)$
$x = 351$
The book has a total of 351 pages.