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Answer :

Let the balls be x

3x:4x:5x
If 4x=12 (green balls)
x=3

Now, Red balls = 3x3
= 9
Blue = 5x3
=15

Total=12+9+15
=36

2) total = 72 balls

Ratio=3x:4x:5x

3x+4x+5x=72
x=6

Red balls = 3x6
= 18