book Maths Puzzle Numerical Ability

The ratio of the volume of two spheres is 216:125. What is the ratio of their diameters?

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book Other Question

X is 6 years younger than Y, and the average of their ages is twice X age 5 years ago, how old are they? solve listing any restrictions
x/x^2+5x-14 +2/x-2 =1/x+7

does x = -8