Friday

December 19, 2014

December 19, 2014

Posted by **Amponsah** on Monday, April 9, 2012 at 4:42am.

- Probability -
**Reiny**, Monday, April 9, 2012 at 9:57amoriginal number of balls --- x

original number of red balls = x/4

number of red balls added = 5

total balls added = 45

new total = x+45

new red ball total = (x/4 + 5)

(1/5)(x + 45) = x/4 + 5

x/5 + 9 = x/4 + 5

times 20

4x + 180 = 5x + 100

x = 80

you had 80 balls

check:

you had 80 of which 20 were red

you added 45 of which 5 were red

new total 125

new number of red = 25

is 25 equal to 1/5 of 125 ? YES!!

**Answer this Question**

**Related Questions**

Math - A bag contains three black balls, four white balls and five red balls. ...

FINITE - selection of colored balls from two bags. Assume that each bag contains...

Finite Math - An urn contains sixteen red balls and seventeen white balls. A ...

Maths - Bag A contains 2 white, 1 black and 3 red balls, Bag B contains 3 white...

Finite Math-Probability - Suppose we have an urn with 10 white balls and 6 red ...

Basic Mathematics - A bag contains 2 red balls, 3 blue balls and 5 green balls. ...

statistics - Assume that each bag contains 6 balls. Bag a contains 3 red and 3 ...

Statistic - A urn contains 21 red balls, 14 white balls If we randomly select 2 ...

math - A bag contains 5 red balls and 7 green balls . A ball is picked at random...

Math - What's the probability of picking out 5 white and 3 red balls from a bag ...