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There are 12 green balls and (x+2) yellow balls in a box. If the probability of selecting a green ball at random is 2/5, find the value of x.

1 Answer

1 vote

Answer:

x = 16

Explanation:

The probability of obtaining a green ball is

P(green) =
(12)/(12+x+2) =
(12)/(x+14) and

P(green) =
(2)/(5), hence equating gives


(12)/(x+14) =
(2)/(5) ( cross- multiply )

2(x + 14) = 60 ( divide both sides by 2 )

x + 14 = 30 ( subtract 14 from both sides )

x = 16

User Martin Ptacek
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