Half of 1600 is 800. To find half of a number, you divide the number by 2. In this case, 1600 divided by 2 equals 800. This can also be represented as 1600 ÷ 2 = 800.
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3200 ÷ 2 = 1600 Note: 50% is half of something.
The question, as posed cannot be answered because you have not stated the units for the half-life. Some things have half lives of millions of years while others have half-lives measured in micro-seconds. Fortunately, Wikipedia came to my rescue and the half-life is 1600 years (approx). The answer is approx 4.3 grams.
2.9% of 1600= 2.9% * 1600= 0.029 * 1600= 46.4
35% of 1600= 35% * 1600= 0.35 * 1600= 560
1600