There are 30 balls which are red, blue or green. If 11 balls are green and the sum of red balls and green balls is less than 25, at most how many red balls are there?	Answers: A) 14 B) 13 C) 16 D) 17 E) 8
r+g+b=30   g=11   r + g &lt; 25   =&gt; r + 11 &lt; 25   =&gt; r &lt; 14   =&gt; at most 13 red balls   ANSWER:13
<result>B</result>
There are 30 balls which are red, blue or green. If 11 balls are green and the sum of red balls and green balls is less than 25, at most how many red balls are there?