The average age of A, B and C is 20 years, if the average age of A and B is 19 years, then what is the age of C?

The water in a river is flowing at the rate of 4 km/hr. If the width and depth of the river is 8m and 4m respectively, then how much water will enter the sea in 15 minutes.

O is the centre of this circle. Tangent drawn from a point P, touches the circle at Q. If PQ = 24 cm and OQ = 10 cm, then what is the value of OP? 

Directions : Study the following bar graph and answer the questions.

company (in lakhs of rupees) for the years 1994-1997:

For the entire four years as shown, the ratio of total gross profit to total net profit is

Mohan lent some amount of money at 9% simple interest and an equal amount of money at 10% simple interest each for two years. If his total interest was Rs. 760, what amount was lent in each case?

In the given question, two equations numbered l and II are given. Solve both the equations and mark the appropriate answer.

I. x² - 28x + 195 = 0

II. y²- 21y + 108 = 0

Two candidates fought an election. One of them got 65% of the total votes casted and won by 420 votes. What is the total number of votes polled if no vote is declared invalid?

 if $$x^4+{16\over x^4}=15617, x>0$$ then find the value of $$x+{2\over x}$$