A) Two quantities x and y are in inverse proportion if \[\frac{x}{y}\] is a constant.
B) If 10 persons can finish a job in 20 days then 5 persons can finish a job in 10 days.
C) Sides of a square and its perimeter are in indirect proportion.
D) The number of teeth and the age of a person vary sometimes directly and sometimes inversely with each other.
E) None of these
Correct Answer: D
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