RRB Group-D Model Paper 14 with answers for online practice

FORMULA USED:
Total surface area of cuboid = 2lb + 2bh + 2hl
Here l, b and h are length, breadth and height.
Volume of cube = a3
CALCULATION:
a3 = 729
⇒ a = 9 cm.
Length of cuboid = 9 + 9 = 18 cm.
Breadth = 9 cm
Height = 9 cm
∴ Total surface area of cuboid = 2 (18 × 9 + 9 × 9 + 9 × 18) = 810 cm2