What is the smallest number divisible by 8, 9 and 12

4 years ago Ramu‘s age is the square root of his father's age. Now the age of Ramu and his father are in the ratio 1:4. Then what is Ramu’s age? 

A metallic right circular cone of volume 36 π  is melt into a sphere. What is the surface area of that sphere?                  

Jafar can complete a work in 6 days. Shyam can complete the same work in 3 days. In how many days Jafer and shyam together can complete the work:

If we arrange the number 1,2,6,3,5,2,4,9 in ascending order, how many numbers keeps the same position?

Kavya is elder than Veena, Anu is younger than Kuttan and Veena is elder than Kuttan. Who is eldest?