GRE Exam Numerical Ability Arithmetic

The quotient of a and b is 3. If a is 60% of c, which is 5/6 times larger than d. What is d in terms of b ? A) 30b/11 B) 6b/11 C) 3b/11 D) 11b/3

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GRE Other Question

Given z=2x, y=3z and xy≠0. What is the value of (6x²+y²)/(xz+yz) ? A)4 B)3 C)5 D)1/3 The sum of x and y is at least 2 but no more than 5. If the total of twice x and three times y is non-negative and no more than 40, then which of the following expresses all possible values of y ?
A) -4 ≤ y ≤ 36 B) -10 ≤ y ≤ 30 C) -10y ≤ y ≤ 36 D) 0 ≤ y ≤ 40 E) 2 ≤ y ≤ 5