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#44 HALF KNOWN IS HALF SOLVED
Which number replaces the question mark?
? 80 245 / A A D / 137 230 65 / CS TH ZN
Correct answer: 30
Explanation:
The values above describe the half-life period of some nuclear isotopes:
CS 137/55 : 30 A (30 years)
TH 230/90 : 80 A (80 years)
ZN 65/30 : 245 D (245 days)
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