MathematicsThree cubes each of side 15 cm are joined end-to-end. What is the total surface area of the resulting cuboid?

Three cubes each of side $15 cm$ are joined end-to-end. What is the total surface area of the resulting cuboid?

Given are three cubes each of side

15 cm

.
We have the following formula,
Surface area of the cuboid =

2 l b + b h + h l

We have,
h=15cm
l = 15 + 15 + 15
= 45cm
b=15cm
Then the surface area will be,
=2(45×15+15×15+45×15)
=2(675+225+675)
=2(1575)

= 3150 cm 2

Thus, the total surface area of the resulting cuboid is

3150 cm 2

.
Therefore the correct option is 2.

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