Ron and Shawn had 60 sweets each. Ron gave 20% of his sweets to Shawn. After receiving the sweets from Ron, Shawn gave 50% of his total sweets to Tammy. How many sweets had Shawn left?

after the first swap,

Ron has 48
Shawn has 72
aft the second swap,
Shawn has 36
Tammy has 36