How can one become a scientist, an economist, a historian…? Does it simply involve reading many books on the subject? Does it involve observing, thinking and doing experiments?

A and B together can do a piece of work in 10 days. If A alone can do the work in 15 days, find in how many days that B alone can do the same work. The following are the steps involved in solving the above problem. Arrange them in sequential order. One day's work of B is (1)/(10)-(1)/(5) . One day's work of A and B is (1)/(10) and one day's work of A is (1)/(15) . B alone can do the work in 30 days. One day's work of B is (1)/(30) .

A and B together can do a piece of work in 10 days. If A alone can do the work in 15 days, find in how many days that B alone can do the same work. The following are the steps involved in solving the above problem. Arrange them in sequential order. One day's work of B is (1)/(10)-(1)/(5) . One day's work of A and B is (1)/(10) and one day's work of A is (1)/(15) . B alone can do the work in 30 days. One day's work of B is (1)/(30) .

There are 3 books of mathematics, 4 of science, and 5 of literature. How many different collections can be made such that each collection consists of one book of each subject, at least one book of each subject, at least one book of literature.

X can do a piece of work in 6 days while Y can do the same work in 8 days. Find in how many days X and Y together can do the same work? The following are the steps involved in solving the above problem. Arrange them in sequential order. One day's work of X is 1/6 one day's work of Y is 1/8 X can do a piece of work in 6 days and Y can do the same work in 8 days. X and Y together can do the same work in 3(3)/(7) days. One day's work of X and Y=(7)/(24)

X can do a piece of work in 6 days while Y can do the same work in 8 days. Find in how many days X and Y together can do the same work? The following are the steps involved in solving the above problem. Arrange them in sequential order. One day's work of X is 1/6 one day's work of Y is 1/8 X can do a piece of work in 6 days and Y can do the same work in 8 days. X and Y together can do the same work in 3(3)/(7) days. One day's work of X and Y=(7)/(24)

Read each statement below carefully and state with reason and examples, if it is true or false. A scalar quantity is one that (a) is conserved in a process (b) can never take negative values (c) must be dimensionless (d) does not vary from one point to another in space (e) has the same value for observers with different orientations of axes.

Observe a dog in your surroundings .how does it get its food? Write your observations. Which parts are involved in taking in food?

There are 3 books of mathematics,4 of science,and 5 of literature.How many different collections can be made such that each collection consists of (1) one book of each subject,(2) at least one book of each subject, (3)at least one book of literature.