DRDO Multi tasking staff Model paper 3

Tips & Tricks
Now the volume of cube = (side)‌3
As three cubes whose edges are 3 cm, 4 cm and 5 cm respectively are melted to from a single cube
Volume of first cube =33=27cm3
Volume of second cube =43=64cm3
Volume of second cube =53=125cm3
∴ Volume of the single resultant cube = 27 + 64 + 125 = 216 cm3
∴ Side of resultant cube = (216) ‌

1

3

= 6 cm
∴ Surface area of the new cube =6×62=216cm3