Answer:
3 months, 124 stamps each.
Step-by-step explanation:
- for xian: by having 64 then in three months he will be having 64+20+20+20 therefore
124 for 3 months.
- for kai: by having 76 then in three months he will be having 76+16+16+16 therefore 124 stamps for 3 three months.
