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Vũ Thị Hương Giang 09/03/2017 at 22:12We have: 18ab: ab = 25
Nguyễn Anh Thư selected this answer.
<=> 18ab = ab x 25
=> 1800 + ab = ab x 25
=> 1800 = ab x 24
=> ab = 1800: 24
=> ab = 75 -
demo acc 10/03/2017 at 14:45very easy
