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Bob and Allen had some beads at first.
Bob gave `1/4` of his beads to Allen.
Next, Allen gave `1/6` of his beads to Bob.
As a result, both Bob and Allen had the same number of beads.
The total number of beads that both Bob and Allen have is 480.
(a) How many beads did Bob have at first?
(b) How many beads did Allen have at first?
Notes to students: