A box contains some black balls and 30 white balls. If the probability of drawing a black ball is two-fifths of a white ball, find the number of black balls in the box.
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we can solve like this
30×twofifth=12 I.e.blackballs
12/42
the answer is 3/8
30×twofifth=12 I.e.blackballs
12/42
the answer is 3/8
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