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Scilla [17]
3 years ago
11

A bag contains only red and blue marbles. Yasmine takes one marble at random from the bag. The probability that she takes a red

marble is 1 in 5. Yasmine returns the marble to the bag and adds five more red marbles to the bag. The probability that she takes one red marble at random is now 1 in 3. How many red marbles were originally in the bag?
Physics
2 answers:
fenix001 [56]3 years ago
5 0
1 because their are only 1 in 5 chance to get a red one 

Lana71 [14]3 years ago
4 0

If there are x red marbles initially then 1/5 is a probability in it's lowest form cancelled down from: 

<span>1/5 = x/5x </span>

<span>so there are 5x total marbles, x red and 4x blue. </span>
<span>Add 5 new red and the new probability is: </span>

<span>(x+5)/(5x+5) = 1/3 </span>

<span>3x+15 = 5x+5 </span>

<span>2x = 10 </span>

<span>originally there were: </span>

<span>x = 5 red </span>
<span>4x = 20 blue </span>

<span>marbles. </span>

<span>*************** </span>
<span>there are now: </span>

<span>x+5 = 10 red </span>
<span>4x = 20 blue </span>

<span>marbles</span>
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