460 cm2 of metal sheet is needed to make a closed box of length 12 cm and height 5 cm. The breadth of the box is : 1. 10 cm 2. 12 cm 3. 14 cm 4. 16 cm

Question

KnowledgeBoat · Accepted Answer

Given, Length(l) = 12 cm Height(h) = 5 cm Total surface area of sheet required to make a closed box = 460 cm2 Let breadth of the box be b cm. Calculating the breadth of the box, Total surface area = 2(lb + bh + hl) ⇒ 460 = 2(12 × b + b × 5 + 5 × 12) ⇒ 460 = 2(12b + 5b + 60) ⇒ 460 = 2(17b + 60) ⇒ 17b + 60 = ⇒ 17b + 60 = 230 ⇒ 17b = 230 - 60 ⇒ 17b = 170 ⇒ b = = 10 cm. Hence, option 1 is the correct option.

Mathematics

460 cm² of metal sheet is needed to make a closed box of length 12 cm and height 5 cm. The breadth of the box is :
10 cm
12 cm
14 cm
16 cm

Mensuration

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Mathematics

460 cm2 of metal sheet is needed to make a closed box of length 12 cm and height 5 cm. The breadth of the box is :10 cm12 cm14 cm16 cm

Mensuration

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460 cm² of metal sheet is needed to make a closed box of length 12 cm and height 5 cm. The breadth of the box is :
10 cm
12 cm
14 cm
16 cm

The volume of a cube is 125 m³. The total surface area of the cube is :
150 m²
250 m²
375 m²
432 m²

The sum of the length, breadth and height of a cuboid is 24 cm, and the length of its diagonal is 15 cm. The area of its total surface is :
348 cm²
349 cm²
350 cm²
351 cm²