Question

Through research, scientists found a person consist of 3.2 x 10^-5 lbs of zinc. In the bodies of 3,500 such people, how much zinc is present.

Answer 1

One person has

`3.2x10^(-5)\text{ lbs of zinc}`

then, in the body of 3500 such people, there are

`3500\cdot3.2x10^(-5)\text{ lbs of zinc}`

this product is equal to

`3500\cdot(0.000032)=0.112\text{ lbs}`

of zinc