Sharon3431
New member
- Joined
- Nov 10, 2016
- Messages
- 5
Hi everyone.
I got the right answer to this, but only through experimentation. Eg 1 4 5; 2, 8, 10; 3, 12, 15; 4, 16, 20;
5, 20, 25; so adding 5 here to the Reds gives me the right fraction. Can someone please show me how to do this algebraically?
Thanks
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
1/5.
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 1/3.
How many marbles of each colour were originally in the bag?
I got the right answer to this, but only through experimentation. Eg 1 4 5; 2, 8, 10; 3, 12, 15; 4, 16, 20;
5, 20, 25; so adding 5 here to the Reds gives me the right fraction. Can someone please show me how to do this algebraically?
Thanks
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
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 1/3.
How many marbles of each colour were originally in the bag?