RRB Assistant Loco Pilot and Technician Model Paper 17 with key

Question : 54 of 75

Marks: +1, -0

Three cubes of sides 6 cm, 8 cm and 1 cm are melted to form a new cube. The surface area of the new cube is:

Solution:

A^3

(6)^3

(8)^3

(1)^3

= 216 + 512 + 1

A^3

= 729 ⇒ A = 9
Surface area of new cube = 6a²
⇒ 6 × 92
⇒ 6 × 81 = 486 cm²

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