GRE Exam Numerical Ability Arithmetic

Theresa is building a pyramid out of stacked rows of tin cans. When completed, the top row of the pyramid contains a single tin can and each row below the top row contains 4 more cans than the one above it. If the completed pyramid contains 861 cans, then how many rows does the pyramid has ? A) 41 B) 21 C) 42 D) 20

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GRE Other Question

Compare the two quantities:
There are 50 students in a class. 27 of them play cricket, 18 play hockey and 10 play neither cricket nor hockey.
Quantity A: The number of students who play both cricket and hockey.
Quantity B: 5

A) Quantity A is greater B) Quantity B is greater C) The two quantities are equal D) The relationship cannot be determined from the information given.
If |-3x+1| < 7, then which of the following represents all possible values of x ?
A) -2 < x B) -2 < x < 8/3 C) -2 ≤ x ≤ 8/3 D) x < -2 or x > 8/3