Question 130146
a) 
1/3 of the cubes have to be blue.
x/(x+24)=1/3
3x=x+24 Multiply each side by 3(x+24)
2x=24
x=12
12+24=36 cubes altogether.
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b)
1/3 probability of pulling out a blue cube
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Now that you understand the answer you can do the last 2 parts.
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Ed