Let's do this question and be are to Spears surface area of BP's 800 percent higher than a volume of
is lower than the volume of B by exposing findings was the video.
Give it a try and then let's do it together.
All right.
We are back.
Let's do it together.
So over here we have two spears, E and B and let the radius of speare A, B, R, E, and let the release
of Speare B are B in that case, the surface area of is four by our square and the surface area of Sparboe
is four by R B Square.
Now it's given that this over here is equal to nine times or Pyi or Square.
Right.
Why is that so.
Because it's mentioned that the surface area of Sparboe is eight hundred percent higher than it.
Right.
What does that mean?
Let's take an example.
Say X is equal to Hundert and it's given that Y is 200 percent greater than X, then what is the value
of white?
The value of white in this case will be under, which is X plus two hundred percentage of hundred.
Right.
That's hundred plus two hundred by a hundred in two hundred.
And that is equal to three in 200 or 300.
Similarly over here it's eight hundred percent higher.
So it's four by our square.
Plus eight times or by are is square, and that is equal to nine times for by R-squared.
All right, let's proceed.
Therefore, we get that R B squared right over here.
I can cut out for paying for pie.
So R B square is equal to nine times or a square.
All right.
Now, this means that R B is equal to three times are now over here.
The volume is will be four by three by are a cube.
Right.
That's the volume of a spear.
And over here the volume will be four by three by RB Q.
Right now, over here, instead of Arby, let's substitute three, but this becomes or by three by industry
are the whole cube, right.
That's equal to twenty seven in two or by three by ah.
A cube.
Right.
Now, over here, if this is equal to white, this would be 27 in white, right?
This is taken as white.
This is 27 into white.
Now we need to find the percentage decrease from 27 white to white.
That's what is our strength.
The volume of it is X percent is lower than the volume of meat.
So you're starting with the volume of B, right?
Because the question is volume of A is lower than the volume of B by person.
So you need to go from twenty seven white to white.
Right.
So the percentage change is change divided by the initial value.
Always remember that if any of you want to find the percentage change, it's change by the initial value
in two hundred.
So over here the change is twenty seven Y minus Y which is twenty six.
But the important thing is you need to take the correct initial value.
Right.
Or here you start with twenty seven y.
Right.
Because you are going down from volume of B, therefore the denominator over here is twenty seven and
the correct answer is twenty six by twenty seven in two hundred.
That's equal to ninety six percentage which is option Deora here.