tolong bantu jawab nomor 67 ya guys...

vol kerucut=pi×r^2×t×1/3
=pi ×(d^2)/4 ×t ×1/3
vol1=15
vol 2=?

masukan ke perbandingan

15/v2=(d^2) ×t /2d^2×3t
15/v2=1/2×1/3
15/v2=1/6
v2=90 cm^3