Answer:
450 gm...this is because we start with 1800/2 = 900 = 30 and 900/2 =450 = 60 yrs. = 450 gm
Explanation:
Every 30 years you'll have half left
After 30 years = 900 grams
after 60 years 450 grams
3.6m questions
4.6m answers