Question
Tim has 5 red beads and some green beads. Then his cousin gave him 7 more green beads and he has a total of 20 beads. How many green beads did he have at first?
4 m

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Tim has 5 red beads and some green beads. Then his cousin gave him 7 more green beads and he has a total of 20 beads. How many green beads did he have at first?