exam Maths Puzzle Numerical Ability

I have hourglass figure. Total h=10. Upper cone radius=3. Lower cone radius=5 Find Volume

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exam Other Question

I have the following system of 7 equations with 8 unknowns:

{{{1-s^2=p1*(1-r1^2)/(1+r1^2)}}}
{{{2*s*r5/(1+r5^2)=2*p1*r1/(1+r1^2)}}}
{{{1-s^2=p2*(1-r2^2)/(1+r2^2)}}}
{{{2*s* The present age of a father exceeds 3 times the present age of his son by 2 years. Six years ago, the age of the father exceeded 4 times the age of the son by 4 years. Find the present ages of the son and the father.