1. 14 students.
2. 16 percent = 24 students
3. 9/25 = 54 students
4. 3 to the third power = 81 students
The answer is 80.
You would first, divide 120 by 3.
Then, multiply 40 by 2.
For every 3 green grapes there are 4 black grapes.
There are 24 green grapes, which is 3*8, so there must be 4 * 8 = 32 black grapes.
Answer is 352 don't know what that Is
After 500 years one would have N nuclei of the original substance.
N = 100 * exp ( -ln(4) ) = 25
LOL.
I guess it is exp( - lamda * t)
Lamda, the decay constant is the ln(2) over the half life.
So we get exp( -ln(2)/250 * 500) or exp ( -ln(4) )
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