There are four numbers in a set. The mean of the three smallest numbers is 9, whereas the mean of the three largest ones is 11. What is the range of the data set? 

A sample of 50 litres of glycerine is found to be adulterated to the extent of 20 % . How much pure glycerine should be added to it so as to bring down the percentage of impurity to 5 %? 

if the monthly salary of a fan employee is increased by , he gets 72 rupees more. His Monthly salary (in rupees) is:

If the 5 digit number 538xy is divisible by 3, 7 and 11, then the value of (x² +y²)  is:

AB is a chord to a circle and PAT is the tangent to the circle at A. If ∠BAT=75° and ∠BAC=45° and C being a point on the circle, then ∠ABC is equal to

Pie chart shows the percent of money spent by family on various item during 1999. Study the graph and answer these questions.

If the total amount spent during the year 1999 was Rs. 46000, the amount spent on food was :

An amount of money appreciates to Rs. 7,000 after 4 years and to Rs. 10,000 after 8 years at a certain compound interest compounded annually. The initial amount of money was 

In an election between two candidates, 75% of the voters cast their votes, out of which 2% votes were declared invalid. A candidate got 9261 votes which were 75% of the valid votes. The total number of voters enrolled in that election was: