A family I know has several children. Each boy in this family has as many sisters as brothers but each girl has twice as many brothers as sisters. How many brothers and sisters are there?

What is the value of (0.75*0.75*.075-0.001) / (0.75*.75-0.075+0.01)

If 13 = 13w/(1-w) ,then (2w)2 = ?

In A,B,C are having some marbles with each of them. A has given B and C the same number of marbles each of them already have.Then, B gave C and A the same number of marbles they already have.Then C gave A and B the same number of marbles they already have.At the end A,B,and C have equal number of marbles. (i) If x,y,z are the marbles initially with A,B,C respectively. Then the number of marbles B have at the end