Question

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?

Answer 1

it can be 8,9,10,11,12

Answer 2

Answer:

There are atmost 5 red ball

Step-by-step explanation:

According to question,

Total number of balls  = 20

Number of green balls = 7

And sum of green and red balls =  less than 13 , that is,

G + R < 13  

So the possibilities are :

7 + 1 < 13

7 + 2 < 13

7 + 3 < 13

7 + 4 < 13

7 + 5 < 13

So number of red balls can be 1 , 2, 3, 4, 5

For atmost red ball , Number of red balls =5

Hence,

There are atmost 5 red ball