<p>If ab>10^5, then the value of a+1/b divided by 5a is closest to which of the following?
a.1
b.2
c.3
d.4
e.5</p>
<p>Well, let’s just divide by 5a.</p>
<p>a / 5a = 1/5</p>
<p>and</p>
<p>(1/b) / 5a = 1/5ab</p>
<p>We know that ab is really big, so 1/5ab should be really small. So the answer is about equal to 1/5, which is closest to 1.</p>
<p>(When I saw this question, I remember the answer was 5…maybe it was originally 5a divided by a?)</p>
<p>ok, i figured it out. You are right…sort of…it’s 1/5 which = .2</p>