GRE Exam Numerical Ability Averages

Integers a and b are consecutive multiples of 6. Integers x and y are consecutive multiples of 8. In terms of a, b, x and y, what is the ratio of the average of a and b and the average of x and y ?

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GRE Other Question

If 0.25(x-y)= -2 and y²-x²=48, then sum of x and y is Of the students of class X of a school, 60% were boys and of these 1/10 were still part of the school after class X exams. If the number of girls who were still part of the school was five times the number of boys who were still the part of school, what percent of the girls were still part of the school ?