RRB Group D 10-Oct-2018 Shift 2 Solved Paper

Question : 20 of 100

Marks: +1, -0

The edge of a cube is doubled. Then its volume becomes _______ times the actual volume.

Solution:

Let the edge of a cube

={a}

units
Actual volume

={a}^{3}

cubic units
New edge

=2 {a}

units
New volume

=(2 {a})^{3}=8 {a}^{3}

cubic units
Thus, new volume

=8 \×

actual volume

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