Since every student in the class passed the exam and John is a student, we can conclude that John passed the exam.

The arrangement is A, C, B, D, E. C is in the middle.

G is the brother of H, and I is the sister of H, so G is also the brother of I.

G and I are siblings as they share the same parents, H.

H is the sister of I, and since I is the mother of J, H is the aunt of J.

'D' = 4, 'O' = 15, 'G' = 7. So, DOG = 4157.

'D' = 4, 'O' = 15, 'G' = 7. Therefore, DOG = 4157.

The students are the youngest as the teacher is older than them.

Since X is older than Y and younger than Z, Y is the youngest.

Higher than expected inflation decreases purchasing power as prices rise faster than income.

If the office is open, then it cannot be a holiday, as the office would be closed on holidays.

If it rains, the ground gets wet. Since it is raining, we can conclude that the ground is wet.

L is last as it is scheduled after K, which is after J.

J and L are both children of K, making them siblings.

J is the wife of L as they are the parents of K.

M is the father of O, making M the father of N's father.

M is the aunt of O because she is the sister of O's father, N.

M is the uncle of N, which means M is the brother of N's parent O, making M the brother-in-law of O.

From M ≥ N and N > O, we can conclude M > O.

15 days from Monday is Wednesday.

O is the father of Q, and since Q is the sister of R, O is also the father of R.

Since Q = R and P > Q, it follows that P > R.

P is heavier than Q is a direct statement from the given information.

Q must be first since P is after Q and R is before P.

P is the aunt of R as well, since R and Q are siblings.

R is the daughter of P as she is the sister of Q, who is the child of P.

P is the grandfather of Q, and since R is the father of Q, P is R's father.

P and R are both children of Q, making R the sister of P.

Since P ≤ Q and Q < R, it follows that P < R.

S is the sister of U as they share the same parents, T.