Mathematics
If x and y be unequal and x : y is the duplicate ratio of x + z and y + z, prove that z is mean proportional between x and y.
Related Questions
Find the mean proportion to (x - y) and (x3 - x2y)
Find two numbers such that the mean proportional between them is 14 and the third proportional to them is 112.
There are 36 members in a student council in a school and the ratio of the number of boys to the number of girls is 3 : 1. How many more girls should be added to the council so ratio of number of boys to number of girls may be 9 : 5 ?