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The total surface area of a cuboidal box is given by S $= 2 (lb + bh + lh)$ . If $S = 940 s q . c m; l = 15 c m; b = 10 c m$ , then $h =$

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13.4

12.8

answer is C.

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Detailed Solution

= 2 (lb + bh + lh)

$940 = 2 [15 (10) + 10 h + 15 h]$

$470 = 150 + 25 h$

$25 h = 320$

$h = \frac{320}{25} = 12.8$

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