The positions of how many digits in the number 2451479638 will remain same when the first half and the second half of the digits are arranged in ascending order separately?

Z is shorter than Y but taller than X. W is shorter than Z but taller than X and V is shorter than Y but taller than Z. The shortest person is?

Consider a group comprising of 4 students: Reena, Beena, Meena and Neena, who stand in a row.Reena and Beena stand in 6th and 7th positions respectively from the left. Meena and Neena stand in the4th and 5th positions respectively from the right. When Beena and Meena exchange their positions, thenBeena will be 15th from the left. Originally, Neena's position from the left is: 

Five friends A, B, C, D and E are standing in a row facing south, but not necessarily in the same order. Only B is between A and E. C is immediate to the right of E and D is immediate to the left of A. On the basis of above information, find the statement which is definitely true? 

P runs faster than T but not as fast as Q. Q runs faster than R but not as fast as S. Who runs fastest among them?

There are five different cottages, M to Q in a row. M is to the immediate right of N and O is to the immediate left of Q and immediate right of M. N is to the immediate right of P. The first cottage from the left is _____ ?

Raju is 10th from the top and Ravi is 21st from the bottom. There are 3 students between them. How many total students are there in the class?