In a row of girls, if Savitha who is tenth from the left and Anita who is ninth from the right interchange their places, Savitha becomes fifteenth from the left. How many girls are there in the row?

How many numbers from $1$ to $100$ are there,each of which is not only exactly divisible by $4$ but also has $4$ as a digit?

In a queue of children,Kashish is fifth from the left and Mona is sixth from the right. When they interchange their places among themselves,Kashish becomes thirteenth from the left. Now what will be Mona's position from the right (in $^{th}$)?

If the first and second digits in the sequence $5, 9, 8, 1, 3, 2, 7, 4, 3, 8$ are interchanged,also the third and fourth digits,the fifth and sixth digits and so on,which digit would be the seventh counting to your left?

If Atul finds that he is twelfth from the right in a line of boys and fourth from the left, how many boys should be added to the line such that there are $28$ boys in the line?

In the following series of numbers,how many times have the figures $9, 1,$ and $8$ appeared together,with $1$ being in the middle and $9$ and $8$ being on either side of $1$ (i.e.,the sequence $9, 1, 8$ or $8, 1, 9$)?
$2, 1, 9, 8, 1, 9, 8, 3, 7, 1, 9, 7, 8, 1, 2, 9, 1, 9, 8, 1, 8, 2, 1, 2$