The respective ratio of radii of two right circular cylinders (a and b) is 2 : 3 the respective ratio of volumes of cylinders a and b is 8 : 15. What is the respective ratio of the heights of cylinders a and b ?
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direct solve r/R=2/3
H/h=8/15
r/h×h/H=2/3×15/8=5/4
(h/r)²×H/h=9/4×8/15=6:5
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