GRE Exam Numerical Ability Algebra

0.5(y-x) = -4 and x² - y² = 40. What is the sum of x and y ? A) 6 B) 5 C) -9 D) -5

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B
0.5(x-y) = 4 => x-y = 8
x^2 - y^2 = 40 => (x+y)(x-y) = 40
x+y = 40/8 = 5
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GRE Other Question

The area of an equilateral triangle is √3 times the area of an isosceles triangle. If the three sides of the isosceles triangle are 5, 5 and 6. Find the length of each side of the equilateral triangle.
A) 4 B) 6 C) 4√3 D) 8 E) 6√ 3 What is the greatest integer that does not satisfy 5(x-6) < 2x -3(2-5x) ? A) -1 B) 0 C) 1 D) -2 E) -3