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Total probability equals 1.
Subtract the probability of blue from 1:
1-0.4 = 0.6
Red and yellow total is 0.6
Since they have the same number of cubes, the probability of both would be the same so divide the remainder by 2:
0.6 /2 = 0.3
The probability of red is 0.3
The probability of yellow is 0.3
30 blue cubes with a probability of 0.4.
Let total cubes = x
30 blue/ x = 0.4
Multiply both sides by x:
30 = 0.4x
Divide both sides by 0.4
X = 30/0.4
X = 75
Total cubes is 75
This doesn’t make sense though because red and yellow are supposed to be the same and if you subtract blue from total it’s an odd number so red and yellow aren’t the same:
75-30 = 45
45/2 = 22.5