Question

Who lives on floor 4?

• A. G
• B. L
• C. B
• D. I
• A. 6^th
• B. 7^th
• C. 8^th
• D. 9^th
• A. 13
• B. 17
• C. 18
• D. 19
• A. A lives on an even numbered floor
• B. C lives on the top floor
• C. More than three persons live between the floors of I and L.
• D. G lives immediately above I.
• A. K
• B. I
• C. G
• D. L

Answer 1

The Correct Option is B

G is living an even numbered floor above floor 7 but on the top floor.
Three persons are living between G and K.

	Case 1	Case 2	Case 3
Floor	Name	Name	Name
12	K
11
10			G
9
7	G	G
6			K
5
4		K
3
2
1

B lives on a floor immediately below K and four persons live between B and J.
Both A and C lives on an odd numbered floor below J but not on a floor immediate next to it.

	Case 1	Case 2	Case 3
Floor	Name	Name	Name
12	K
11	B
10			G
9
8	G	G
7
6	J		K
5			B
4		K
3	A/C	B
2
1	A/C

Four persons cannot live between B and J in case 2 and case 3. Hence, both will be eliminated.
Therefore-

	Case 1	Case 1.A
Floor	Name	Name
12	K	K
11	B	B
10
9
8	G	G
7
6	J	J
5
4		K
3	A	C
2
1	C	A

D lives on an even numbered floor and immediately above I.
The sum of the floor numbers of I and C is same as the sum of the floor numbers of A and E.
F lives on an odd numbered floor.

	Case 1	Case 1.A
Floor	Name	Name
12	K	K
11	B	B
10	D	D
9	I	I
8	G	G
7	E
6	J	J
5	F
4
3	A	C
2
1	C	A

Here, we see that sum of the floors of I and C is not equal to the sum of the floors of A and E in case 1.A. Hence, it will be eliminated.
L lives above H.

	Case 1
Floor	Name
12	K
11	B
10	D
9	I
8	G
7	E
6	J
5	F
4	L
3	A
2	H
1	C

L lives on floor 4.
So, the correct option is (B):  L.

Answer 2

G is living an even numbered floor above floor 7 but on the top floor.
Three persons are living between G and K.

	Case 1	Case 2	Case 3
Floor	Name	Name	Name
12	K
11
10			G
9
7	G	G
6			K
5
4		K
3
2
1

B lives on a floor immediately below K and four persons live between B and J.
Both A and C lives on an odd numbered floor below J but not on a floor immediate next to it.

	Case 1	Case 2	Case 3
Floor	Name	Name	Name
12	K
11	B
10			G
9
8	G	G
7
6	J		K
5			B
4		K
3	A/C	B
2
1	A/C

Four persons cannot live between B and J in case 2 and case 3. Hence, both will be eliminated.
Therefore-

	Case 1	Case 1.A
Floor	Name	Name
12	K	K
11	B	B
10
9
8	G	G
7
6	J	J
5
4		K
3	A	C
2
1	C	A

D lives on an even numbered floor and immediately above I.
The sum of the floor numbers of I and C is same as the sum of the floor numbers of A and E.
F lives on an odd numbered floor.

	Case 1	Case 1.A
Floor	Name	Name
12	K	K
11	B	B
10	D	D
9	I	I
8	G	G
7	E
6	J	J
5	F
4
3	A	C
2
1	C	A

Here, we see that sum of the floors of I and C is not equal to the sum of the floors of A and E in case 1.A. Hence, it will be eliminated.
L lives above H.

	Case 1
Floor	Name
12	K
11	B
10	D
9	I
8	G
7	E
6	J
5	F
4	L
3	A
2	H
1	C

G lives on 8^th floor.
So, the correct option is (C):  8^th

Answer 3

G is living an even numbered floor above floor 7 but on the top floor.
Three persons are living between G and K.

	Case 1	Case 2	Case 3
Floor	Name	Name	Name
12	K
11
10			G
9
7	G	G
6			K
5
4		K
3
2
1

B lives on a floor immediately below K and four persons live between B and J.
Both A and C lives on an odd numbered floor below J but not on a floor immediate next to it.

	Case 1	Case 2	Case 3
Floor	Name	Name	Name
12	K
11	B
10			G
9
8	G	G
7
6	J		K
5			B
4		K
3	A/C	B
2
1	A/C

Four persons cannot live between B and J in case 2 and case 3. Hence, both will be eliminated.
Therefore-

	Case 1	Case 1.A
Floor	Name	Name
12	K	K
11	B	B
10
9
8	G	G
7
6	J	J
5
4		K
3	A	C
2
1	C	A

D lives on an even numbered floor and immediately above I.
The sum of the floor numbers of I and C is same as the sum of the floor numbers of A and E.
F lives on an odd numbered floor.

	Case 1	Case 1.A
Floor	Name	Name
12	K	K
11	B	B
10	D	D
9	I	I
8	G	G
7	E
6	J	J
5	F
4
3	A	C
2
1	C	A

Here, we see that sum of the floors of I and C is not equal to the sum of the floors of A and E in case 1.A. Hence, it will be eliminated.
L lives above H.

	Case 1
Floor	Name
12	K
11	B
10	D
9	I
8	G
7	E
6	J
5	F
4	L
3	A
2	H
1	C

The sum of the floor numbers of J, H and B is 19.
So, the correct option is (D):  19.
 

Answer 4

G is living an even numbered floor above floor 7 but on the top floor.
Three persons are living between G and K.

	Case 1	Case 2	Case 3
Floor	Name	Name	Name
12	K
11
10			G
9
7	G	G
6			K
5
4		K
3
2
1

B lives on a floor immediately below K and four persons live between B and J.
Both A and C lives on an odd numbered floor below J but not on a floor immediate next to it.

	Case 1	Case 2	Case 3
Floor	Name	Name	Name
12	K
11	B
10			G
9
8	G	G
7
6	J		K
5			B
4		K
3	A/C	B
2
1	A/C

Four persons cannot live between B and J in case 2 and case 3. Hence, both will be eliminated.
Therefore-

	Case 1	Case 1.A
Floor	Name	Name
12	K	K
11	B	B
10
9
8	G	G
7
6	J	J
5
4		K
3	A	C
2
1	C	A

D lives on an even numbered floor and immediately above I.
The sum of the floor numbers of I and C is same as the sum of the floor numbers of A and E.
F lives on an odd numbered floor.

	Case 1	Case 1.A
Floor	Name	Name
12	K	K
11	B	B
10	D	D
9	I	I
8	G	G
7	E
6	J	J
5	F
4
3	A	C
2
1	C	A

Here, we see that sum of the floors of I and C is not equal to the sum of the floors of A and E in case 1.A. Hence, it will be eliminated.
L lives above H.

	Case 1
Floor	Name
12	K
11	B
10	D
9	I
8	G
7	E
6	J
5	F
4	L
3	A
2	H
1	C

More than three persons live between the floors of I and L.
So, the correct option is (C): More than three persons live between the floors of I and L.
 
 

Answer 5

G is living an even numbered floor above floor 7 but on the top floor.
Three persons are living between G and K.

	Case 1	Case 2	Case 3
Floor	Name	Name	Name
12	K
11
10			G
9
7	G	G
6			K
5
4		K
3
2
1

B lives on a floor immediately below K and four persons live between B and J.
Both A and C lives on an odd numbered floor below J but not on a floor immediate next to it.

	Case 1	Case 2	Case 3
Floor	Name	Name	Name
12	K
11	B
10			G
9
8	G	G
7
6	J		K
5			B
4		K
3	A/C	B
2
1	A/C

Four persons cannot live between B and J in case 2 and case 3. Hence, both will be eliminated.
Therefore-

	Case 1	Case 1.A
Floor	Name	Name
12	K	K
11	B	B
10
9
8	G	G
7
6	J	J
5
4		K
3	A	C
2
1	C	A

D lives on an even numbered floor and immediately above I.
The sum of the floor numbers of I and C is same as the sum of the floor numbers of A and E.
F lives on an odd numbered floor.

	Case 1	Case 1.A
Floor	Name	Name
12	K	K
11	B	B
10	D	D
9	I	I
8	G	G
7	E
6	J	J
5	F
4
3	A	C
2
1	C	A

Here, we see that sum of the floors of I and C is not equal to the sum of the floors of A and E in case 1.A. Hence, it will be eliminated.
L lives above H.

	Case 1
Floor	Name
12	K
11	B
10	D
9	I
8	G
7	E
6	J
5	F
4	L
3	A
2	H
1	C

Except I , all others live on a floor which is even.
So, the correct option is (B): I.