The area of 4 walls of a hall is $320 m^{2}$ . The length and breadth of the hall are 12.5 m and 7.5 m respectively. Find the height of the wall? [3 MARKS]

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Solution

Concept: 1 Mark
Application: 2 Marks

Let the height of the wall be x.

Area of four walls $= 2 (l h + b h)$

320 $= 2 (12.5 x + 7.5 x)$

320 $= 2 (20.0 x)$

320 $= 2 (20 x)$

320 $= 40 x$ .

$∴ x = \frac{320}{40}$

$x = 8 m$
Hence, the height is equal to 8m.

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The area of 4 walls of a hall is 320 m2. The length and breadth of the hall are 12.5 m and 7.5 m respectively. Find the height of the wall? [3 MARKS]

Concept: 1 Mark Application: 2 Marks Let the height of the wall be x. Area of four walls =2(lh+bh) 320 =2(12.5x+7.5x) 320 =2(20.0x) 320 =2(20x) 320 =40x. ∴ x=32040 x=8mHence, the height is equal to 8m.

The area of 4 walls of a hall is $320 m^{2}$ . The length and breadth of the hall are 12.5 m and 7.5 m respectively. Find the height of the wall? [3 MARKS]

Concept: 1 Mark
Application: 2 Marks

Let the height of the wall be x.

Area of four walls $= 2 (l h + b h)$

320 $= 2 (12.5 x + 7.5 x)$

320 $= 2 (20.0 x)$

320 $= 2 (20 x)$

320 $= 40 x$ .

$∴ x = \frac{320}{40}$

$x = 8 m$
Hence, the height is equal to 8m.