Math, asked by wwwanuragverma307, 10 months ago

A cube of each side 'a' is elongated in such a way that one side is increased by 20% while the other two sides arereduced by 5% and x% respectively. Calculate the value of 'x' and change in the total surface area​

Answers

Answered by amitnrw
17

x = 12.28  & 0.87% change in the total surface area​  when cube is elongated 20% increase in one side & 5 & x % decrease in two sides

Step-by-step explanation:

A cube of each side 'a

Volume = a³

Surface Area = 6a²

One side increased by 20 % = a + (20/100)a = 1.2a

second side reduced by 5 % = a - (5/100)a = 0.95a

Third Side = a  - (x/100)a =  a (1 - x/100)

Equating Volume

1.2a  * 0.95a  * a (1 - x/100) = a³

=> 1  - x/100  =  1/1.14

=> x/100 = 1  - 1/1.14

=> x/100  =  0.14/1.14

=> x = 14/1.14

=> x = 12.28 %

x = 12.28

Sides are   1.2a  ,  0.95a  &  a/1.14

Surface area = 2 ( 1.2a * 0.95a  + 1.2a * a/1.14  + 0.95a * a/1.14)

= 2a² ( 1.2996 + 1.2 + 0.95) /1.14

= 6.052a²

increase in surface Area = 6.052a²  - 6a²

= 0.052a²

% increase in surface Area = (0.052a²/6a²)* 100 = 0.87%

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