Consider a small unit of a factory where there are 5 employees : a supervisor and four labourers. The labourers draw a salary of ₹5,000 per month each while the supervisor gets ₹ 15,000 per month. Calculate the mean, median and mode of the salaries of this unit of the factory.

There are two factories located one at place P and the other at place Q. From these locations, a certain commodity is to be delivered to each of the three depots situated at A, B and C. The weekly requirements of the depots are respectively 5,5 and 4 units of the commodity while the production capacity of the factories at P and Q are respectively 8 and 6 units. The cost of transportation per unit is given below : How many units should be transported from each factory to each depot in order that the transportable cost is minimum. When will be the minimum transportation cost?

Calculate the electricity bill amount for the month of November of a family if 4 tube lights of 40 W each for seven hours, a TV of 150 W for three hours and two bulbs of 60 W each for four hours are used per day. The cost per unit is RS 3.50.

In Yound's double slit experiment,wer get 15 fringes per cm on the screen,while using light of wavelength 5,600 overset @A (sodium lamp).How many fringes per cm we get with ligth of wavelength 7,000 overset@A ?