GRE Exam Numerical Ability Ratio and Proportion

Jaison's collection contains US, Russian and British stamps. If the ratio of US to Russian stamps is 5 to 3 and the ratio of Russian to British stamps is 5 to 1, what is the ratio of US to British stamps?

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GRE Other Question
x and y are integers
x + y < 12 , and x > 7
What is the smallest possible value of x - y ? A 5 by 3 rectangle is inscribed in circle. What is the circumference of the circle?