It’s b you better pick b because it’s b
<span>All of the following are basic needs of young children, except
(B) play </span>
The average adult has about about 5.5 liters of blood in them
If the half-life is 5 minutes, then 30 minutes is equivalent to 6 half-lives. So, after six successive half-lives, the 400 mg of the radioisotope would have a mass of 400(0.5)⁶ = 6.25 mg.
Thus, A would be the correct answer choice here.
