There are three newspapers A, B and C. Out of 100 persons, 60read A, 50 read B, 50 read C, 30 read A and B, 20 read B and C, 30 read A and C, 10 read none. How many read all the newspapers?

In a survey of 60 men,it is found that 25 men studied the newspaper H,26 men studied the newspaper T,26 men studied the newspaper I,9 men studied the newspaper H and T,8 men studied the newspaper T and I and 3 men studied all the three newspapers.Then find (i)The no of mens who read atleast one newspaper.

In a survey of 100 persons it is found that 42 read India Today, 30 Sunday, 28 Outlook, 10 India Today and Sunday,'5 India Today and Outlook, 8 Sunday and Outlook and 3 read all the three. How many read none of the three magazines?

Among the number of students in a class 25 read physics.30 read chemistry and 20 read mathematics.If 12 read both physics and chemistry,15 read chemistry and mathematics,18 read physics and mathematics and 10 read all the three subjects find the number of students in the class.

A person cannot see objects nearer than 1.2 m from his eyes. He wants for read a newspaper placed at a distance of 30 cm clearly. What is the nature and the power of lens required for this purpose?

The temperature of equal masses of three liquids A,B and C are 12°C,19°C and 28°C respectively.The temperature ,when A and B are mixed is 16°C and when B and C are mixed ,it is 23°C .What will be temperature when A and C are mixed.

Joseph jogs from one end A to other end B of a straight 300 m road in 2 minutes 30 seconds and then turns around and jogs 100 m back to point C in another 1 minute. What are Joseph’s average speed and velocities in jogging (a) from A to B and (b) from A to C?

A manometer reads the pressure of a gas in an enclosure as shown in Fig. 10.25 (a) When a pump removes some of the gas, the manometer reads as in Fig. 10.25 (b) The liquid used in the manometers is mercury and the atmospheric pressure is 76 cm of mercury. (a) Give the absolute and gauge pressure of the gas in the enclosure for cases with mercury)

Three charges 2.0 * 10^-6 C, 3.0 *10^-6 C and 4.0 * 10^-6 C are placed at the three corners A, B. C of an equilateral triangle of side 20 cm. Find the force on the charge at C due to the rest two.

For any three sets A,B,C prove that : A-(B uu C ) = (A-B) nn (A-C)