There are 20 balls which are red, blue or green. If 7 balls are green and the sum of red balls and green balls is less than 13, at most how many red balls are there? Options: A) 4 B) 5 C) 6 D) 7 E) 8
Explanation :   GIVEN:   RED + GREEN + BLUE = 20   GREEN = 7   SOLUTION:   R + G &lt; 13   THEREFORE R + 7 &lt; 13   SO r &lt; 6   ANS: AT most 5 red balls   B. 5   Hence (B) is correct.   Answer : 5
<result>B</result>
There are 20 balls which are red, blue or green. If 7 balls are green and the sum of red balls and green balls is less than 13, at most how many red balls are there?