GRE Exam Numerical Ability Area and Volume

Two similar triangles have areas in the ratio 64:36. What is the ratio of their perimeters?

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GRE Other Question

Which of the following is a common factor of both equations x² – 4x – 5 and x² – 6x – 7 ? English language has 26 alphabets, out of 4 distinct vowels and 7 distinct consonants, how many letter patterns can be made with each to contain 3 distinct consonants and 2 distinct vowels?