Volumes Practice Test 1

Question : 28 of 40

Marks: +1, -0

One cubic metre piece of copper is melted and recast into a square cross-section bar 36m long. An exact cube is cut off from this bar. If 1 cubic metre of copper costs Rs. 108, then the cost of the cube is

25 paise
50 paise
75 paise
one rupee

Validate

Solution:

Here,

a^2 × 36

= 1
⇒

a^2

1/{36}

∴ a =

1/6

m
Volume of the required cube =

(1/6)^3

1/{216} m^3

Since, cost of the cube = Rs. 108 ×

1/{216}

= Re.

1/2

= 50 paise

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