In a row of boys, if A is 10th from left and B is 9th from the right and interchange their positions, A becomes 15th from the left. How many boys are there in the row?

In a row of children Dipti is 9th from the left and Kashish is 13th from the right. when they exchange their positions and then Dipti becomes 18th from the left. What is the new position of Kashish from the right end of the row?

In a row of girls, Kamya is 5th from the left and Preeti is sixth from right. When they exchange their position, then Kamya becomes 13th from the left. What is the new position of Preeti from right?

A is 13th from top, B is 18th from bottom. When A and B change their position then A becomes 21th from top. What is the new position of B from bottom?

If A is the mother of B. C is the son A, D is the brother of E, E is the daughter of B. Who is the grandmother other of D?

In the following series find the missing numbers.
5, 13, 40, 104,?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
FU, LO, RI, ?

In each of the following questions, a sequence is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
2, 3, 5, 9, 17, ?