<PRE><B>Question 1084202</B>
x = number of pages

After reading 2/3 on the first day, there are 1/3 pages remaining, so:

{{{ (1/3)x - (3/5)((1/3)x) = 40 }}}
{{{ (1/3)x - (1/5)x = 40 }}}
{{{  5x - 3x = 600 }}}
{{{   2x = 600}}}
{{{  highlight(x = 300) }}}

—
Check:  300 * 2/3 = 200 pages read on first day (leaving 100)
              100 * 3/5 = 60 pages read on 2nd day (leaving 40, ok)</PRE>