GRE Exam Numerical Ability Ratio and Proportion

Tina, Edward, and Lauren agree to share the cost of a gift and to make their contributions in proportion to their ages. Edwards age is 1/2 of Tina’s age, and Lauren’s age is 1/3 of Edward’s age. If Lauren’s share of the cost is $ 2.50, what is the cost of the gift?

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GRE Other Question

3, 7, 9, 14, x
The numbers in the list above are ordered from least to greatest. If the average (arithmetic mean) is 2 greater than the median, what is the value of x? One integer will be randomly selected from the integers 11 to 60, inclusive. What is the probability that the selected integer will be a perfect square or a perfect cube?
(A) 0.1 (B) 0.125 (C) 0.16 (D) 0.5 (E) 0.9