Choose the correct answer.

y +$\int$ y - (x + y) - [y - (y - x - y)] + 2x ]=?

A car parking charges n take for the first hour, and m paisa for every additional hour. What amount it will charge if a car stayed for 5 hours?

The difference between two numbers is 7 and their product is 60, then one of the two numbers must be

Reena bought some chocolates to distribute to her friends. If she gives 3 chocolates to each friend, one friend will get only 2 chocolates. Also, if she gives 2 chocolates to each friend, she will be left with 15 chocolates. How many chocolates did she buy?

3 years ago, the average age of a family of 5 members was 17 years. With the birth of a new baby, the average remains the same even today. Find the age of the baby.