4 POUNDS because 20oz plus 16oz plus 1 pound (16oz) plus 12oz equals 64oz and there are 16oz in a pound so divide 64 by 16 and that comes out to 4 witch means YOUR ANSWER IS 4 POUNDS OR 64OZ
If the half-life is t, then every t days, the amount of the radioactive isotope will be cut in half. (1/2)^(number of half-lives) = 3% number of half-lives = ln(0.03) / ln(0.5) This gives the number of half-lives as 5.06. Then 300 days = (5.06)(length of 1 half-life) length of 1 half-life = 300 / 5.06 = 59.29 days
