In a bag of marbles,3/5 of the marbles are blue and the rest are red.if the number of red marbles is doubled and the number of blue marbles stays the same,what is the ratio of red to total marbles
Let's assume the bag contains 5x marbles in total (where x is a positive integer).
3/5 of the marbles are blue, so there are (3/5)(5x) = 3x blue marbles.
The rest of the marbles are red, so there are (5x - 3x) = 2x red marbles.
If the number of red marbles is doubled, there will be 2(2x) = 4x red marbles.
The total number of marbles will remain the same, so there will be 5x marbles in total.
The ratio of red to total marbles is 4x/5x = 4/5.