RRB Assistant Loco Pilot and Technician Model Paper 10 with solutions

Question : 18 of 75

Marks: +1, -0

Three iron cubes, the lengths of whose sides are 3 cm, 4 cm and 5 cm respectively, are moulded and a new cube is formed. The length of the side of the new cube would be

4 cm
6 cm
12 cm
20 cm

Validate

Solution:

Total volume of smaller cube
=

3^3 + 4^3 + 5^3

= 27 + 64 + 125 = 216
∴ Volume of larger cube = 216
∴ Side of larger cube =

(216)^{1/3}

= 6 c.m.

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