Question
A bag contains black and white beads in the ratio of 2 : 7. There is a total of 135 beads in the bag. How many more black beads must be added into the bag so that the number of black beads will be the same as the number of white beads?
2 m

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A bag contains black and white beads in the ratio of 2 : 7. There is a total of 135 beads in the bag. How many more black beads must be added into the bag so that the number of black beads will be the same as the number of white beads?