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:
72 comments Page 2 of 8.
Bittu Rana said:
10 months ago
B = 20% of A.
Then B% of 20 = (20% of A)% of 20,
= 20/100 of A/100 of 20,
= (20/100)*(A/100)*20
= (4/100)*A = 4% of A.
Then B% of 20 = (20% of A)% of 20,
= 20/100 of A/100 of 20,
= (20/100)*(A/100)*20
= (4/100)*A = 4% of A.
(13)
Subhashini R said:
3 months ago
20%of a = b
(20/100)a = b
(1/5)a = b
b = a/5.
Then b% of 20 = ?
b/100 = 20.
subs b = a/5.
(a/5)/100 = 20.
a/500 = 20.
a/25 = 0.004 x a.
It means 4% of a.
(20/100)a = b
(1/5)a = b
b = a/5.
Then b% of 20 = ?
b/100 = 20.
subs b = a/5.
(a/5)/100 = 20.
a/500 = 20.
a/25 = 0.004 x a.
It means 4% of a.
(6)
Varun said:
5 years ago
A = 100,
B = 20.
20% of B = 2 * 2 = 4.
B = 20.
20% of B = 2 * 2 = 4.
(6)
JIYA said:
3 years ago
Hi,
20/100a * 1/100 * 20 ,
400a/10,000,
4/100a%.
Now,
4/100 *100 = 4%.
20/100a * 1/100 * 20 ,
400a/10,000,
4/100a%.
Now,
4/100 *100 = 4%.
(6)
ADITYA KSHETRASIMHA said:
7 months ago
Really good, thanks all.
(6)
Samrat said:
12 months ago
But here we considered a as 100, but if we consider a as 10, the answer will be different, which is 20% of a; then it should not be considered as universal.
(5)
Tenzin Tshedup said:
5 years ago
Let's say a = 100.
0.2 * 100 = 20 which is B,
So,
0.2 * 20 = 4 which is equal to 0.04 * 100= 4.
0.2 * 100 = 20 which is B,
So,
0.2 * 20 = 4 which is equal to 0.04 * 100= 4.
(5)
SANKAR NAYAK said:
5 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)
Ritesh said:
3 years ago
(5/3)X - P% of (5/3)X = (3/5)X.
After solving this equation for the value of P, we will be getting the percentage error.
After solving this equation for the value of P, we will be getting the percentage error.
(4)
Shiya Chandrawanshi said:
4 months ago
It is really good. Thanks everyone for explaining it.
(4)
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