a) 25.9%
b) 44.44%
c) 35%
d) 32%
Answer: b
Explanation: Total number of cubes = 160 + 56 = 216
Side of cube = 6 unit
No. of cubes without exposure = (6 – 2)3 = 64
Thus 64 cubes will be inside of a big cube
Now, rest cubes = 160 – 64 = 96
No. of cubes with one face outside = 6 × (4 × 4) = 96
Required % = $$\frac{{90 \times 100}}{{216}} = 44.44\% $$
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