Three years ago the ratio of the ages of Amisha and Nimisha was $8:9$ respectively. Three years hence the ratio of their ages will be $11:12$ respectively. What is the present age of Amisha?

$120$ people can complete a piece of work in $30$ day. In how many days can $150$ people with twice the efficiency can complete the same piece of work?

The sum of the two digits of a two-digit number is $15$. The difference between the two digits of the number is $3$. What is the product of the two digits of a two-digit number? 

The profit earned after selling a pair of trousers for $₹2148$ is the same as incurred loss after selling the same pair of trousers for $₹1018$. What is the original cost price of trousers?