Data Sufficiency

Study the following question and decide which of the statements is/are sufficient to answer the question.
Question:
What is the total age of Nakul and Dwij?
Statements:
1. Nakul is 12 years old today.
2. Dwij is younger to Nakul by 3 years.

Study the following question and statements, and decide which of the statements is/are sufficient to answer the question.
Question: J, K, L, M, N and O are standing in a row. If we arrange them according to their height from tallest to shortest, who is standing in the third place?
 Statements:
1. L is the tallest
2. J is taller than K
3. N is the shortest of all
4. K is taller than O

How many children are there between P and Q in a row of children?
Statements:
I. P is fifteenth from the left in the row.
II. Q is exactly in the middle and there are ten children towards his right.

Directions: Study the following information and answer the questions given below:
Who amongst A, B, C, D and E is the heaviest?
I. A is heaviest than D and B but not than E.
II. C is not the heaviest person.
III. D is not the thinnest person.

Direction: Each of the question below consists of a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statements are sufficient to answer the questions. Read both the statements and given answer.
(A) if the data in statement I alone are sufficient to answer the question, while the data in statement II alone are not sufficient to answer the question.
(B) if the data in statement II alone are sufficient to answer the question, while the data in statement I alone are not sufficient to answer the question.
(C) if the data either in statement I alone or in statement II alone are sufficient to answer the question.
(D) if the data even in both statement I and II together are not sufficient to answer the question.
Which direction is Shipla facing?
I. If Meena who is currently facing South turns 90° towards her left, she would face the same direction as Shilpa.
II. If Uday who is currently facing North, turn 90° towards his left, he would face a direction just opposite to the direction Shipla is facing.