can anyone help me with these sat math problems?

Test Preparation SAT Preparation
1

<p>When the positive integer m is divided by 5, the remainder is 3. What is the remainder when 20m is divided by 25?</p>

<p>The answer is: 10</p>

<p>I dont get it....i got 2...can anybody explain?</p>

2

<p>and a writing one as well please?</p>

<p>Long thought of as a quiet, stuffy place where people just borrowed books, libraries have been changing their images dramatically over the last few years. No Error.</p>

<p>The answer is: a quiet, stuffy place.</p>

<p>IT doesnt make sense</p>

3

<p>The math question deals with modular arithmetic.</p>

<p><a href="http://en.wikipedia.org/wiki/Modular_arithmetic%5B/url%5D"&gt;http://en.wikipedia.org/wiki/Modular_arithmetic&lt;/a&gt;&lt;/p>

<p>You don't need to know that much though. Just pick any number that, divided by 5, leaves 3. Let's say 8. 8/5 = 1R3. 20*8 = 160. 160/25 = 6R10.</p>

<p>The writing one deals with the agreement between "libraries" (plural) and "place" (singular). It should be "quiet, stuffy places".</p>

4

<p>^ ditto what he said.lol</p>

5

<p>omg duh.....looks obvious now</p>

6

<p>
[quote]
Long thought of as a quiet, stuffy place where people just borrowed books, libraries have been changing their images dramatically over the last few years. No Error.

[/quote]
</p>

<p>It should read "Long thought of as quiet stuffy place*s*..." There needs to be agreement between "places" and "libraries" (both are plural)</p>