Aptitude - Percentage - Discussion
Discussion Forum : Percentage - General Questions (Q.No. 6)
6.
If 20% of a = b, then b% of 20 is the same as:
Answer: Option
Explanation:
20% of a = b  |
20 | a = b. |
| 100 |
 b% of 20 = |
 |
b | x 20 |  |
= | |
20 | a x | 1 | x 20 | |
= | 4 | a = 4% of a. |
| 100 | 100 | 100 | 100 |
Discussion:
69 comments Page 1 of 7.
SANKAR NAYAK said:
4 years ago
If 20% of a=b means B =(20/100)*a ----> eq(1)
And b%of 20 means (b/100)*20 ----> eq(2).
If we put eq(1) value in eq(2) Then,
[{(20/100)*a}/100]*100
If we simply fy it = {100/(100*20*a)}*20,
=> 1/(20*a)*20.
=> 1/a So ans is incorrect.
If we modify qn and put 20% of b then
(20/100)*b.
We put b value i.e b = (20/100)*a,
Then => (20/100)*(20/100)*a,
If we simply fy it , then,
(20*20/100*100)*a.
And answer will be (4/100)*a.
Means 4% of a.
And b%of 20 means (b/100)*20 ----> eq(2).
If we put eq(1) value in eq(2) Then,
[{(20/100)*a}/100]*100
If we simply fy it = {100/(100*20*a)}*20,
=> 1/(20*a)*20.
=> 1/a So ans is incorrect.
If we modify qn and put 20% of b then
(20/100)*b.
We put b value i.e b = (20/100)*a,
Then => (20/100)*(20/100)*a,
If we simply fy it , then,
(20*20/100*100)*a.
And answer will be (4/100)*a.
Means 4% of a.
(4)
Cosmicguypradeep said:
1 decade ago
@habiha
here is the answer
% increase = (actual increase/original price *100)%
% decrease = (actual decrease/ original price *100)%
so, for this question we have to calculate % increase (since the pen was sold at higher rate 45, which was actually bought for 15 Rs)
(60-15/15 *100)% = 300%.
here is the answer
% increase = (actual increase/original price *100)%
% decrease = (actual decrease/ original price *100)%
so, for this question we have to calculate % increase (since the pen was sold at higher rate 45, which was actually bought for 15 Rs)
(60-15/15 *100)% = 300%.
Sriramamurthi said:
5 years ago
@All.
20% of a = b so in question they are given the b value.
Then b% of 20 do now,
Instead of b %, put the value of b,
20/100 of a*20 then cancel it properly. You will get the value of 4% of a.
That will be our required answer.
20% of a = b so in question they are given the b value.
Then b% of 20 do now,
Instead of b %, put the value of b,
20/100 of a*20 then cancel it properly. You will get the value of 4% of a.
That will be our required answer.
(2)
Prasad M said:
6 years ago
As percent always calculates at 100 ref. Let a= 100.
20% of a means - 20 which is b acc to question.
20 percent of again 20 (got above) is 4 percent of a.
This doesn't require any paper calculations I believe, Hope it helps.
20% of a means - 20 which is b acc to question.
20 percent of again 20 (got above) is 4 percent of a.
This doesn't require any paper calculations I believe, Hope it helps.
(3)
Narmadha said:
7 years ago
If you consider a=50, then the answer will not be 4%, there is no clue in the question that one should take a=100. When I assigned a=100 I got the answer as 4%, then when I assigned different value for a, the % varies.
Kiran mali said:
9 years ago
20% of a = b.
Means,
20/100 * a = b.
0.2a = b.
Means b = 0.2a,
Now b % of 20 = suppose x,
Means b/100*20 = x,
But b = 0.2a,
Meas 0.2a/100 * 20 = x
4a/100 = x.
Means we get that's value x = 4% of a.
Means,
20/100 * a = b.
0.2a = b.
Means b = 0.2a,
Now b % of 20 = suppose x,
Means b/100*20 = x,
But b = 0.2a,
Meas 0.2a/100 * 20 = x
4a/100 = x.
Means we get that's value x = 4% of a.
(1)
Kowsigan said:
9 years ago
Fresh grapes contain 80% water by weight and when the grapes are died, raisins contain 25% by weight.
How many kgs of fresh grapes are needed to get 20kg of raisins?
Please someone explain to solve this.
How many kgs of fresh grapes are needed to get 20kg of raisins?
Please someone explain to solve this.
Shivam Patel said:
6 months ago
Take 100% as complete;
Now solve the first part;
20% of A means 20% of 100,
Then B is already the same as A means B is also 20%.
According to the question;
B = 20%.
20% of 20 is 4.
Now solve the first part;
20% of A means 20% of 100,
Then B is already the same as A means B is also 20%.
According to the question;
B = 20%.
20% of 20 is 4.
(25)
Arun . S said:
1 decade ago
Here, 20% of a=b i.e.,(20/100)a=b
then, b%20 i.e.,(b/100)*20---I
then sub b=(20/100)a in I
we get,
=(20/100)a * (1/100) * 20
=(20/100)a * (20/100)
=(400/10000)a
=(4/100)a
= 4% of a
then, b%20 i.e.,(b/100)*20---I
then sub b=(20/100)a in I
we get,
=(20/100)a * (1/100) * 20
=(20/100)a * (20/100)
=(400/10000)a
=(4/100)a
= 4% of a
(1)
Naveen said:
10 years ago
20 percentage of a = b.
Then 20 percentage of b = ?
b = 20 percentage of a.
20 percentage of b = 20 percentage of 20 percentage of a.
= 20/100*20/100 of a = 4 percentage of a.
Then 20 percentage of b = ?
b = 20 percentage of a.
20 percentage of b = 20 percentage of 20 percentage of a.
= 20/100*20/100 of a = 4 percentage of a.
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