Let \(j\) be the number of pages Janet has to read.
so Hallie has \(10j\) pages to read.
Altogether, they must read \(10j + j\) pages, which is \(11j\). So this means that \(11j\) must be equal to \(264\).
If you divide both bits by \(11\), you get \(j = \frac{264}{11} = 24\).
So, Janet has to read \(j\) pages, which is \(24\), and Hallie has to read \(10j\) pages, which is \(240\).