GRE Exam Numerical Ability Algebra

Set X consists of the positive multiples of 5 and set Y consists of the odd prime numbers less than 20. If set Z consists of every distinct integer less than 100, that is the product of one element from set X and one element from set Y, then set Z consists of how many elements ? (A) 12 (B) 15 (C) 13 (D) 16 (E) 14

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GRE Other Question
Given an alphabet of 26 letters, with 21 consonants and 5 vowels. How many three letter words can be formed with a consonant as the first letter and a vowel as the last letter ? (A) 3180 (B) 2730 (C) 2190 (D) 2190 Integers x and y are consecutive multiples of 8. Integers a and b are consecutive multiples of 6. In terms of x, y, a and b, what is the ratio of the average of x & y and the average of a & b ? (A) (x+y)/(a+b) (B) (a+b)/(x+y) (C) a+b/4/y-x/4 (D) (4/3)(a+b)/(x+y)