Question

A cuboid of length 20 cm by 16 cm by 8 cm is melted to form smaller cubes of length 4 cm. What is the number of cubes that can be obtained?

Answer 1

Answer:

Correct option is

C

7:24

Number of cubes =

Volumeofcube

Volumeofcuboid

=

1×1×1

8×4×2

=64

Surface area of cuboid =2×(8×4+4×2+2×8)cm

2

=2×(32+8+16)cm

2

=112cm

2

Surface area of 64 cubes =64×6cm

2

=384cm

2

∴ Required ratio =

384

112

=

24

7

=7:24

Step-by-step explanation:

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