Question
A bag contains purple and black beads in the ratio of 3 : 7. There is a total of 130 beads in the bag. How many more purple beads must be added into the bag so that the number of purple beads will be the same as the number of black beads?
2 m

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A bag contains purple and black beads in the ratio of 3 : 7. There is a total of 130 beads in the bag. How many more purple beads must be added into the bag so that the number of purple beads will be the same as the number of black beads?