There are 3 red balloons, 2 white and 4 blue balloons and one balloon of each colour bursts. What fraction of the total number of balloons are now blue? [ 3 Marks ]

Initially there are

3 red balloons
2 white balloons
4 blue balloons

After bursting, there are

Red balloons = 3 -1 = 2
White balloon = 2- 1 = 1
Blue balloons =4 -1 = 3 [ 1 mark ]

Now ,the total number of balloons = 2+1+3
= 6 [ 0.5 marks ]

We know that fraction = $\frac{Part}{Whole}$
So the fraction of blue balloons = $\frac{BlueBalllons}{TotalBalloons}$ [ 1 Mark ]
Therefore, the fraction of blue balloons = $\frac{3}{6}$
[ 0.5 Mark ]