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Dawn : Evelyn
1 : 4
==> 3 : 12
=> 3u and 12u (Total 15u)
Dawn gave 1/3 away ==> left 3u-1u = 2u
Evelyn gave 3/4 away ==> left 12u-9u = 3u
total left = 2u+3u = 5u
==> 5u = 90
u = 18

So 15u = 18×15 = 270 stickers at first

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