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?
a)4
b)5
c)6
d)7

• Given there are 7 green balls.
  Sum of red and green balls < 13
  X + Y < 13
  X + 7 < 13
  X < 13 – 7
  X < 6
  So maximum no of red balls can be 5
  
• 12 years agoHelpfull: Yes(26) No(0)
• there are total 20 balls which are red,blue,green
  now 7 balls are green
  sum of red balls and green balls is less than 13 means
  green+red
• 12 years agoHelpfull: Yes(2) No(4)
• there are total 20 balls which are red,blue,green
  now 7 balls are green
  sum of red balls and green balls is less than 13 means
  green+red
• 12 years agoHelpfull: Yes(1) No(0)
• ans:5.we can have max 12 red & green balls.7balls are green so atmost we can have 5 red balls
• 12 years agoHelpfull: Yes(1) No(0)
• there are total 20 balls which are red,blue,green
  now 8 balls are green.sum of red balls and green balls is less than 13 means
  green+red
• 12 years agoHelpfull: Yes(0) No(0)
• there is problem in posting ,so it is nop posting my answer completely,so
  g+r
• 12 years agoHelpfull: Yes(0) No(0)