Question

If each edge of a cube is increased by 50%, find the percentage increase in Its surface area

A) 125% B) 150% C) 175% D) 110%

Answer 1

Answer:

Let cube's side is x

Then it's surface area will be 6x^2

Now increasing it's side by 50%

New side= (3x/2)

Again surface area= 6×(3x/2)^2

= 6x^2× 9/4

Now subtracting these to surface area=(9/4–1)×x^2

= (5/4)×x^2

So it's increased by 5/4

Now for converting it in percentage e know that we have to multiple it with 100

(5/4)×100= 125%( OPTION A)

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