At first ––

Adam : 45%

Ben : 100%

After —

Adam : 45% + 39

Ben : 100% + 20

(45% + 39)  ——- 75% x (100% + 20) = 75% + 15

75% – 45% = 30% ——- 39 – 15 = 24

1% ——- 24/30 = 0.8

100% ——- 80

45% x 80 = 36

Ans : 36 stickers.

Thank you.

My pleasure.