Logical Puzzles - General Questions

In a race, you overtake the person in second place. What position are you in now?

How many times does the digit 7 appear in the numbers from 1 to 100?

A bat and a ball cost Rs. 110 in total. The bat costs Rs. 100 more than the ball. How much does the ball cost?

A farmer has 17 sheep. All but 9 run away. How many are left?