We know that volume of a hemisphere=(1/2)*(4/3)*pi*r³----> (2/3)*pi*r³
volume of a cone=(1/3)*pi*r²*h h=r so volume of a cone=(1/3)*pi*r²*r----> (1/3)*pi*r³
volume of a hemisphere/volume of a cone = [(2/3)*pi*r³]/[(1/3)*pi*r³] =(2/3)/(1/3) =2 volume of a hemisphere=2*volume of a cone <span>the volume of the hemisphere is twice the volume of the cone</span>
Let P be the number of kids, we know P>57 take 1-(1/2)-(1/5)=3/10 therefore 57 is 3/10P 3/7P=57 P=57*7/3=133 is the answer it would be incorrect if we didnt get a positive integer.
