Seven equal cubes each of side 5 cm are joined end-to-end.

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Seven equal cubes each of side 5 cm are joined end-to-end. Find the surface area of the resulting cuboid . ?

1. 750 sq cm
2. 1500 sq cm
3. 2250 sq cm
4. 700 sq cm

Correct Option: A

Given, l = Length of the cuboid = 5 x 7 = 35 cm
h = Breadth of the cuboid = 5 cm
h = Height of the cuboid = 5 cm
∴ Surface area = 2(lb + bh + lh) = 2[35 x 5 + 5 x 5 + 35 x 5]
= 2[175 + 25 + 175]
= 2 x 375 = 750 sq cm