The present ages of Trisha and Shalini are in the ratio of $7:6$ respectively. After $8$ years, the ratio of their ages will be $9:8$. What is the difference in their ages?

In how many days $10$ women can finish the work ?

I. $10$ men finish the work in $6$ days.

II. $10$ women and $10$ men finish the work in $3\frac{3}{7}$ days.

III. If $10$ men work $3$ days and after that $10$ women are deployed to work for men, the rest work is finished in $4$ days.

In the following question, it is followed by information given in three statements I, II and III. You have to study the question along with the statements and decide the information given in which of the statements is necessary to answer the question.

What is the present age of Sabir?

I. The present age of Sabir is half of his father's age.

II. After five years the ratio of ages of Sabir and his father is $6:11$.

III. Sabir is younger to his brother by five years.

What is two-digit number?

I. The difference between the number and the number formed by interchanging the digit is $27$.

II. The difference between two digits is $3$.

III. The digit at unit's place is less than that at ten place by $3$.