GRE Exam Numerical Ability Geometry

A triangle has sides measuring 7 cm and 12 cm. Which of the following is a possible values for the perimeter of the triangle ? (A) 21 (B) 23 (C) 24 (D) 25

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GRE Other Question

If a and c are positive integers and 4a + 3 = b and 4c + 1 = d, which of the following could be the value of b + d? (A) 46 (B) 58 (C) 68 (D) 74
(E) 82 180 students go to a school book exhibition. 110 buy English books, 90 buy Hindi books and at least 30 buy both. What is the least number of students who could have bought neither English nor Hindi books ?