A box contains some black balls and 30 white balls. If the probability of drawing a black ball is 2/5 of
a white ball, then find the number of black balls in the box.
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Step-by-step explanation:
The sum has it,s method itself.
2/5 of 30
= 2
---- × 30
5
= 12
Ans-Therefore there are 12 black balls
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