A bag contains 40 ball out of which some are red, some are blue and remaining is black. If the probability of drawing a red ball is 11/20 and that of blue ball is 1/5, then what is the no of black ball.
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Answer: 10
Step-by-step explanation: 11/20= 22/40
so red balls = 22 balls.
1/5= 8/40
so blue balls=8 balls.
no. of black balls= 22+8/40=30/40
no. of black balls= 10 balls
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