, 2019

Solution 1

One third of 396 is $396\div3=132$. Thus, Joshua has read 132 pages of the book.

To finish the book, Joshua has $396-132=264$ pages left to read.

Solution 2

Joshua has read the first third of the book only, and so he has $1-\frac13=\frac23$ of the book left to read.

Two thirds of 396 is $396\times\frac23=\frac{396\times2}{3}=\frac{792}{3}=264$.

Joshua has 264 pages left to read.