Question

two cubes each of volume for 64 cm cube are joined end to end find the surface area of the resulting cuboid

Answer 1

take the sum as
volume of cuboid=64
take height=a , length=2a, breadth=a

Answer 2

length of each side of a cube = 64cube root. = 4 cm.

there fore , when two equal cube were placed together
l=4 *2 =8 cm,b = 4 cm, c =4 cm.

now, surface area of cuboid = 2( lb + bl + hl)
= 2(8*4 + 4*4 + 4*8)
= 2 (90)
= 180 cm sq.

Hope it helps u.
Thanku.