Question 562335
I presume they are in feet


One is 12x18x30. 

Volume = L*W*H
12x18x30=6480 cu.ft



 The other is 13x24x30

=9360

9360+6480 =14840 cu.ft

1 cu.ft = 7.48 gallons

14840/7.48= 1984 gallons ( rounded off)