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first, bequest is a noun. The verb is bequeath. I know, I know -- in English any noun can be verbed, but why bother, when there is already a perfectly good verb available? This is a sure sign of an incompetent attorney!
Anyway, if the estate has $x,
the red cat gets x/2 -1000
Stripey gets x/3 - 800
Blacky gets x/4 - 600
Add up all the parts:
x/2-1000 + x/3-800 + x/4-600 = x
x = 28,800
Now you can figure out each cat's share.