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If breadth is 10 cm and height is 20 cm then what is the length?

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15 cm.

25 cm.

5 cm.

50 cm.

answer is A.

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Detailed Solution

Given that, breadth is 10 cm and height is 20 cm.
We have to find the length.
TSA of cuboid

= 2 (l b + b h + h l)

, where l is the length, b is the breadth and h is the height of the cuboid.
Let’s assume that

l

is the length,

⇒ 2 l b + b h + h l = 1300 ⇒ l b + b h + h l = 13002 ⇒ l × 10 + 10 × 20 + 20 × l = 650 ⇒ 30 l = 650 − 200

⇒ l = 45030 ⇒ l = 15

Thus, the length of the cuboid is 15 cm.
Hence, option 1 is the correct option.

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