if x is the number of black marbles from a set of 40 colourful marbles, another 30 black marbles are added to it and the probability becomes twice as the first case , what is the value of x

### Asked by acshanadhana15 | 6th Aug, 2020, 01:53: PM

### In the first case, total no. of marbles = 40 and no. of black marbles = x

### Answered by Renu Varma | 11th Aug, 2020, 11:50: AM

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