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2015 AMC 12A Question 7

AMC12 · 2015 AMC 12A

Question 7

Two right circular cylinders have the same volume. The radius of the second cylinder is $10\%$ more than the radius of the first. What is the relationship between the heights of the two cylinders?
  1. The second height is $10\%$ less than the first.
  2. The first height is $10\%$ more than the second.
  3. The second height is $21\%$ less than the first.
  4. The first height is $21\%$ more than the
    second.
  5. The second height is $80\%$ of the first.