Tuesday

October 21, 2014

October 21, 2014

Posted by **Mingma Sherpa** on Thursday, May 5, 2011 at 6:48pm.

- Algebra -
**Reiny**, Thursday, May 5, 2011 at 7:30pmoriginal bag

yellow marbles -- y

black marbles --b

so y/(y+b) = 7/8

8y = 7y + 7b

y = 7b

new bag:

yellow marbles -- y+6

black marbles --- b

(y+6)/(y+6+b) = 9/10

10y+60 = 9y+54+9b

y = 9b - 6

then 9b-6 = 7b

2b=6

b = 3

then y = 7(3) or 21

so there were 21 yellow and 3 black

for a total of 24 marbles

check:

Prob(yellow) = 21/24 = 7/8

new bag:

27 yellow, still 3 black, total 30

prob(yellow) = 27/30 = 9/10

- Algebra -
**Mingma Sherpa**, Thursday, May 5, 2011 at 7:55pmhow did you get a positive 6

- Algebra -
**Reiny**, Thursday, May 5, 2011 at 9:28pmIn your question, didn't it say that 6 yellow marbles were added ????

**Answer this Question**

**Related Questions**

Math - There are 150 green marbles and 100 yellow marbles in a bag that contains...

Probabilities - A jar contains 2 red marbles, 3 green marbles, 4 blue marbles, ...

Algebra - A jar contains red, blue and yellow marbles.The number of red marbles ...

algebra - a bag contains 3 green marbles, 2 yellow marbles, and 5 blue marbles. ...

Math - A bag contains 3 red marbles, 5 yellow marbles and 6 orange marbles. ...

Math-Probability - Hello, I'm trying to figure out this probability problem. Can...

Math - One bag contains 5 red marbles, 4 blue marbles, and 3 yellow marbles, and...

Math - Bobby has a bag of marbles with nine red marbles, 13 yellow marbles and ...

algebra2/ Trigonometry - A bag contains 24 green marbles, 22 blue marbles, 14 ...

prealgebra - a bag contains 6 red marbles, 5 yellow marbles, 7 blue marbles, and...