Red cubes

There are 15 white and several red cubes in the box. The probability of accidentally pulling out a white cube is 20%. How many red cubes are in the box?

Correct answer:

c =  60

Step-by-step explanation:

p=20%=10020=51=0.2  p = 15 / (15+c)  p (15+c)=15 0.2 (15+c)=15  0.2c=12  c=0.212=60  c=60

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