SOLUTION: Ina bag there 4 white balls and some red balls. If the probability of drawing the white ball from the bag is 2/5, how many red balls are there in the bag?
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Question 1083321: Ina bag there 4 white balls and some red balls. If the probability of drawing the white ball from the bag is 2/5, how many red balls are there in the bag? Answer by ikleyn(52824) (Show Source):
Your equation is
=
where "r" is an unknown number of red balls.
Simplify and solve for "r":
4*5 = 2*(4+r) ----> 20 = 8 + 2r ----> 2r = 20-8 ----> 2r = 12 ----> r = = 6.
Answer. 6 red balls.
