2004
Mathematics
67ca00ce0c643c71d77dee1f
Some white balls put in a basket containing twelve red balls and sixteen black balls. If the probability of picking a white balls from the baskets is 3/7, how many white balls were introduced?
A.
12
B.
21
C.
28
D.
32
Correct Answer: 21
Explanation
Number of white balls = x Number of red balls = 12 Number of black balls = 16 Total number of balls = 28 + x P(white balls) = 3/7 But P(white balls) = x/(28+x)=3/7=x/(28+x) 3(28+x)=7x84+3x=7x7x-3x=844x=84x=21
Number of white balls = x Number of red balls = 12 Number of black balls = 16 Total number of balls = 28 + x P(white balls) = 3/7 But P(white balls) = x/(28+x)=3/7=x/(28+x) 3(28+x)=7x84+3x=7x7x-3x=844x=84x=21THIS WEEK's
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