1. How many numbers from 10 to 70 are divisible by 11?

2. In a queue of 20 persons buying tickets from a counter, if every fifth person from the
counter is female and the person at the beginning and at the end of the queue is also
female, how many persons in the queue are male?

3. In a row of 45 pupils, the first boy is followed by one girl, the second boy is followed
by two girls, the third boy is followed by three girls, and so on. What is the number of
girls in the first 25 pupils of the row?

4. In the sequence below, how many even numbers are immediately preceded by 4 as
well as immediately followed by 7? Sequence: 4786274728474174

5. Which of the following will be the middle digits of the middle number after reversing
the digits of the following numbers: 102, 345, 678, 789, 890?

6. A number is greater than 22 but less than 30. Also, it is greater than 24 but less than
28. Then the number is:

7. How many numbers from 1 to 100 are there, each of which is not only exactly
divisible by 6 but also has 6 as a digit in it?

8. How many 8s are there in the following number sequence that are immediately
preceded by 5 but not immediately followed by 9? Sequence: 5 8 1 3 5 8 2 7 5 8 9 5 8
4

9. How many numbers from 25 to 50 are divisible by 5 but not by 10?

10. Which one of the following pairs is different from the other four?