How much water can this hold

Question

I have a bin that has $24$x$24$ cm and is $34$ cm deep. How much water could it hold? It's also in a cone-ish shape, the bottom part is $20$x$20$ cm. If possible answer considering the cone shape, if not then it's okay.

Answer 1

A "cone-ish" shape is a fustrum.

But this sounds like a truncated pyramid. Either way the formula is about the same.

$\frac 13 (S^2 + Ss + s^2) h = \frac 13 (24^2 + 24\cdot 20 +20^2)34 = 16,501\ cm^3 = 16.5$ liters