Find the exact value of the following question:

$$ \sqrt {123×8+2389-1164}=? $$

A boat covers 48 km. upstream and 72 km. downstream in 12 hours, while it covers 72 km. upstream and 48 km. downstream is 13 hours. The speed of stream is -

The distance traveled by three cars in the ratio of 1: 2: 3. If the travel time ratio is 3: 2: 1, what is the ratio of their speed?

Direction: Study the following information and answer the related questions. P, Q, R, S, T, A, B, C, D and E are employees of a company. A table shows the average age of any two employees of the company. The average age of A and B is 27.5.
i.e. average age of A & P is given as (A+P)/2=39.5

What is the ratio of ages of Q and E?

A room in a house measures 5 m in height and its length is 3 times its breadth. The cost of whitewashing its four walls at Rs. 2.50 per sq m is Rs. 200. What is the cost of carpeting the floor at Rs. 5 per sq m? 

Directions: Study the following data and answer the questions. 

The score of students of a class are given as follows :

The number of students whose IQ score is 100 and more is 

If x, y are two positive real number and  $$x^{1/3}=y^{1/4}$$, then which of the following relations is true?

The greatest number which when divided by 989 and 1327 leaves remainder 5 and 7 respectively is