Hi all need help for this question. TIA!!!

Amy. Beatrice and Calin had some stickers. Calin had 18 more stickers than Amy. Calin had 3/4 as many stickers as Beatrice. After Amy and Calin received a total of 36 stickers from Beatrice in a ratio of 3:1 respectively, all the three girls had the same amount of stickers.

a) How many stickers did Calin have at first?

b) What is the ratio of Amy’s stickers to Beatrice’s stickers to Calin’s stickers at first?