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Hint: To find the number of cones, first we will find the volume of the circular cylinder and divide it with the volume of one ice-cream cone.

So,

Number of cones volume of the circular cylinder ÷ volume of one ice-cream cone

= $\dfrac{{\pi \times 6 \times 6 \times 15}}{{\dfrac{1}{3} \times \pi \times 3 \times 3 \times 12 + \dfrac{{2\pi }}{3} \times {3^2}}} = \dfrac{{\pi \times 36 \times 15}}{{\dfrac{\pi }{3} \times \left( {108 + 54} \right)}} = 10$

Answer $10$ cones

Note: In these questions, make sure you take the volume of the entities and not the area or perimeter.

Remembering the volume formulas is often helpful.

So,

Number of cones volume of the circular cylinder ÷ volume of one ice-cream cone

= $\dfrac{{\pi \times 6 \times 6 \times 15}}{{\dfrac{1}{3} \times \pi \times 3 \times 3 \times 12 + \dfrac{{2\pi }}{3} \times {3^2}}} = \dfrac{{\pi \times 36 \times 15}}{{\dfrac{\pi }{3} \times \left( {108 + 54} \right)}} = 10$

Answer $10$ cones

Note: In these questions, make sure you take the volume of the entities and not the area or perimeter.

Remembering the volume formulas is often helpful.