Question 334813
<pre><font size = 3 color = "indigo"><b>
It takes 20 2's for the UNITs' digits only of <font color = "red">0</font>2, <font color = "red">1</font>2, <font color = "red">2</font>2, <font color = "red">3</font>2, etc., thru <font color = "red">19</font>2.
That's because the digits I've colored red before the last 2's are the numbers
from <font color = "red">0</font> to <font color = "red">19</font>, which is 20 2's needed for the UNITs' digits only.

It takes the remaining two 2's to make the ten's digits of 22 and 122.  
So she uses her last 2 on page 192.  But she won't need any more
2's till she gets to page 200, which she won't be able to number because
she will be out of 2's.  So she can only number through page 199, choice e. 

Edwin</pre>