1/2 (50%) of them.
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The half-life of C14 is 5730 years so the given period is 5 half-lives. You should, therefore, expect approx 2-5 = 0.03125 of the original C14 to remain.
3/5 would remain. 1 - 2/5 = 3/5.
To get the mixed number of 3.750, first separate the whole number - that will remain constant. So you have 3 and 750/1000 (the fraction equivalent to .750) Now all you need to do is simplify the fraction. Both the numerator and the denominator are divisible by 250. Through simplifying, the fraction would be 3/4. Now just put the two numbers together, and the answer is 3 3/4.
6 hours = 2 half lives, thus 25 % would remain. 0.25 x 2 mg = 0.5 mg.Done another way...fraction remaining = 0.5^n where n = number of half lives = 6hr/3hr = 2fraction remaining = 0.5^2 = 0.250.25 x 2 mg = 0.5 mg
Remain, or remainder, is the amount left over when one number is divided into another, but doesn't divide equally. For example, 25 divided by 6 is 4, with a remainder of 1.