Answer: (c) = 10
Number of cones = \(\frac{Volume\,of \,cylindrical\,icecream\, container}{Volume\,of\, one\,cone\,filled\, with\, icecream}\)
= \(\frac{\pi r_1^2 h_1}{(Vol.\, of\, conical\, part \,+ \,Vol.\, of\, hemispherical\, part)}\)
= \(\frac{\pi r_1^2 h_1}{\frac{1}{3}\pi r_2^2 h_2 \, +\, \frac{2}{3}\pi r_2^3}\)
= \(\frac{\pi r_1^2h_1}{\frac{1}{3}\pi r_2^2(h_2+2r_2)}\)
= \(\frac{3 \times 6\times 6\times 15}{3 \times 3\times (12+6)} = \frac{1620}{162}\)
= 10
