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- Senior | Next Rank: 100 Posts
- Posts: 62
- Joined: Thu Jul 03, 2008 4:52 am
First, you should know what you are comparing.
The least height in every class is the greatest height-the range.
So,
for A the least height is g-r
for B, the least height is h-s.
So we have to compare (h-s) with (g-r).
First statement gives us that r<s, but nothing about h and g.
Second statement, gives us that g>h, but nothing about s and r.
So the statements taken separately cannot solve the problem.
If we take both statements, we have that g>h and r<s. Now remember what we are comparing.
They ask you if (g-r)>(h-s). This can be written as g-r-(h-s)>0, or
(g-h)+(s-r)>0. We know that both terms are positive (g>h and s>r), so the sum has to be positive.
We solved the problem using both statements, so both together are sufficient.
