A rectangular prism is a cuboid so volume of cuboid is base area x height which is 5x5x12=300 
volume of pyramid is 1/3 x base area x height = 5x5x6x1/3=50 thus volume outside pyramid and inside cuboid is 300-50=250
        
                    
             
        
        
        
H = 2f / (m+1)
[multiply by (m+1)]
h(m+1) = 2f
[divide by 2]
f = (h (m + 1)) / 2
3b / (b+2) = 12 / (b+2)
[multiply by (b+2)]
3b = 12
[divide by 3]
b = 4
3 / (6x + 1) / 2 = 8 / (x + 4) / 3
[multiply both denominators to mike one denominator]
3 / 8(6x+1) = 8 / 3(x+4)
[expand brackets]
3 / (48x + 8) = 8 / (3x + 12)
[multiply by (48x + 8)]
3 = 8(48x + 8) / (3x+12)
[multiply by (3x+12)]
3(3x +12) = 4(48x + 8)
[simplify]
9x + 36 = 192x + 32
173x = 4
x = 4 / 173
        
             
        
        
        
You just have to divide the decimals
        
             
        
        
        
Answer:

Step-by-step explanation:
From the question we are told that:
Percentage of  Green beads 
Percentage of  Red beads    
Percentage of Purple beads 
Therefore 
Probability of choosing a Green bead is 
  
Probability of choosing a Red bead is 
  
Generally the equation for choosing a green bead then a red bead is mathematically given by
Since Outcomes are independent
  
  