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April 17, 2014

April 17, 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!!

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