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Total Surface Area of a Cuboid

Archit's inco...

Question

Archit's income is 20% more than Deepak, then Deepak's income is less than Archit by ________ percent .

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Solution

total surface area cuboid $= 2 (l b + b h + b l)$
$= 2 (7 \times 4 + 3 \times 4 + 21) = 2 (28 + 12 + 21)$
$= 2 (40 + 21)$
$= 2 (61) = 122$
Archit $= \frac{120}{100}$ Deepak
$\frac{- D e e p a k + A r c h i t}{A r c h i t} \times 100 = \frac{1.2 D e e p a k - D e e p a k}{1.2 D e e p a k}$
$= \frac{0.2}{1.2} \times 100$
$= 16.3 %$

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