GRE Exam Numerical Ability Profit and Loss

Question
If a sweater sells for $48 after a 25 percent markdown, what was its original price?
A. $56
B. $60
C. $64
D. $68
E. $72

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GRE Other Question

Question
If the integer a is a multiple of 6, the integer b is a multiple of 3, and a>b>0, then which of the following integers must be a^2 – b^2 multiple of?
A. 6
B. 8
C. 9
D. 10
E. 12
Question
If x + y =8 and y- x = -2, then y=
A. -2
B. 3
C. 5
D. 8
E. 10