The ratio of present ages of Shyam and Sohan is 7: 8 respectively. Four year hence this ratio becomes 9: 10 respectively. What is Shyam's present age in years?

The ratio of age of two boys is 5 : 6. After two years the ratio will be 7 : 8. The ratio of their age after 12 years will be 

Six years ago, the ratio of the ages of Kunal and Sagar was 6 : 5. Four years hence, the ratio of their ages will be 11 : 10. What is Sagar's age at present?

Direction : Each of the questions below consists of a question and two statements numbered I and II are given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read both the statements and
Give answer
(A) If the data in statement I alone are sufficient to answer the question, while the data statement II alone are not sufficient to answer the question.
(B) If the data in Statement II alone are sufficient to answer the question, while the data in statement I alone are not sufficient to answer the question.
(C) If the data in statement I alone or in Statement II alone are sufficient to answer the question.
(D) If the data in both the statement I and II are not sufficient to answer the question.
(E) If the data in both the statement I and II together are necessary to answer the question.

What is the mother’s present age?
I. Present ages of mother and child are in the ratio of 5:1 respectively.
II. Four years hence the ratio of the ages of mother and child will be 17:5 respectively.

Five years ago, the average age of 4 girls was 7 years. On joining a new girl, the present average age becomes 13 years. The current age of the new girl is: