self Maths Puzzle

(1/10)18 - (1/10)20 = ?
A. 99/1020 B. 99/10 C. 0.9 D. None of the above

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self Other Question

A father is 30 years older than his son, however he will be only thrice as old as the son after 5 years, what is the father's present age ? A. 40 yrs B. 30 yrs C. 50 yrs D. None of the above Ans. A taxonomy : classification :: ? A. etymology : derivation B. autonomy : authorization C. economy : rationalization D. tautology : justification E. ecology : urbanization Ans. A