Keisha makes a large sandwich for a family picnic. she takes 1/2 of the sandwich to the picnic. at the picnic, her family eats 3/8 of the whole sandwich. what fraction of the whole sandwich does keisha bring back from the picnic?

1/8 becaue 1/2 equals 4/8 so if she brought 4/8 with her take away 3/8 that would equal 1/8

Volume is length times width times height so
20 times 8 times 30 which is 4,800
surface area is ph (p is perimeter of base), h is height.
so perimeter would be length+length+width+width so 20+20+8+8 which is 56. so multiply 56 times 30 which is 1680. hope this !