GRE Exam Numerical Ability Number System

For a given two-digit positive integer, the tens digit is 5 greater than
the units digit. The sum of the digits is 11. Find the integer.

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GRE Other Question

What is the value of the function defined by f(x)=3x^2+7x+23, When x=2? If the ratio of 2x to 5y is 3 to 4, what is the ratio of x to y ?