Changing Ratio

by Thandar Linn
(Myanmar)

The ratio of the number of Meili's books to Sulin's was 1:2 at first. After Meili bought another 12 books, the ratio became 2:1.

(a) How many books did Sulin have?
(b) If Sulin now buys another 5 books, what will be the new ratio of the number of Meili's books to Sulin's?

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