exam Maths Puzzle Numerical Ability

If 40 mg of a radioactive substance decays to 5mg in 12 minutes, find the half-life, in minutes, of the substance.

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exam Other Question

I need some help:
Solve: x/5x+10+x-3/x+2=7/5

and

3/7=15/x You scored 88.7, 91.2, and 94.6 on your last three test scores. Find the standard deviation of your test scores.
A. 0.95
B.1.22
C.2.42
D.4.35