Question

three cubes of metal with edges 3 cm, 4 cm and 5 cm are melted to form a sing
cube. Find the total surface area of the cube formed.

​

Answer 1

Answer:

edge = 3 = a

6*a*a=54

edge =4=a

6*a*a=96

edge=5=a

6*a*a=150

Answer 2

Answer:

Vol. of 1st Cube = 3^3 = 27 cm^3

Vol. of 2nd Cube = 4^3 = 64 cm^3

Vol. of 3rd Cube = 5^3 = 125 cm^3

Vol. of New cube formed = vol of cube(1st + 2nd + 3rd)

= (27 + 64 + 125) cm^2

= 216 can m^3

Vol of new cube = 216 cm^3

edge = 3√216

= 3√6×6×6

= 6 cm Ans...